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Installed a new CPU for my PC but nothing comes up on my monitor and the mouse and keyboard don't work

3.6K views 40 replies 5 participants last post by  Macboatmaster  
#1 ·
I just bought an AMD Ryzen 7 5800x processor for my PC which I installed on my motherboard, along with the heatsink and everything, however nothing comes up on the screen and the mouse + keyboard don't work, however I just put back in my old ryzen 5 1600 CPU and it works fine. I tried taking out and re inserting the motherboard battery and switching on the PC without anything plugged in. I also do have the correct BIOS version which is F51g, please help!

PC specs:
Motherboard: Gigabyte AB 350 Gaming
(new) CPU: AMD Ryzen 7 5800X
CPU cooler: Noctua NH-U12A
RAM 2x 8GB DDR4
GPU: MSI GTX 1070TI
PSU: 650 Watts
 
#2 ·
What BIOS version is your motherboard running? Did you check the mb support grid?

 
#4 ·
That chart seems to imply that version F52h is required. At least that is how I read it.

@crjdriver is our resident expert on these things. Perhaps he can shed some light.
 
#7 ·
It appears your current bios supports that cpu however a few caveats.
When you see a suffix on a gigabyte bios, that is a beta NOT release bios. With a board that old, gigabyte is not going to put any time into writing a release bios. Here is what I would do;
1 Pull out your new processor and install the old one
2 Update the bios to the latest one listed on the support page
3 Once done, pull out the old processor and install the new one
4 Clear cmos with the clear jumper
5 Pw ON and see if you get a display. Note it will take longer for the first boot to pass POST ie an extra 15~20 seconds

If it sill does not work, then you probably have a DOA processor.
 
#9 ·
#10 ·
what please occurred with the 5700x


as on your previous discussion - as you are on the same board, the same GPU and you had already updated to F51g for that 7 - 5700X
(85) Problem updating my BIOS | Tech Support Guy (techguy.org)
back in December 2022
Well I updated the BIOS in anticipation for the CPU change but recieved a faulty CPU from ebay, turns out one of the pins was bent. In the end I just decided to stay with the one I had as it was actually decent for gaming.
 
#17 ·
It is most likely a cpu problem. You said you purchased the processor from amazon however amazon also brokers third party sales. Unless youj see sold/shipped by amazon, you may be dealing with a third party seller.
RMA the processor.
To make it a bit more clear, you're dealing with Amazon directly if the listing shows sold and shipped by Amazon. Because there are lots of third party sellers that have Amazon fulfill their orders from Amazon's warehouses and will show sold by "x" seller and shipped by Amazon.
 
#20 ·
There is one final thought that comes to my mind
Have a look at the motherboard and check the revision number
If yours is the first of that motherboard generation
eg revision 1.0
That MAY be the problem

The version or revision numbers are printed on the PCB on all range of GIGABYTE's Motherboard. You can find the corresponding "REV: 1.X on the top left corner of the Motherboard. When you wish to update either bios or driver please make sure the correct driver or bios is selected to correspond to your Revision of motherboard.

Your board
GA-AB350-Gaming (rev. 1.x) Specification | Motherboard - GIGABYTE U.S.A.


  1. AM4 Socket: Supports AMD 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3rd Gen Ryzen™/ 2nd Gen Ryzen™/ 1st Gen Ryzen™/ 2nd Gen Ryzen™ with Radeon™ Vega Graphics/ 1st Gen Ryzen™ with Radeon™ Vega Graphics/ Athlon™ with Radeon™ Vega Graphics Processors
(Please refer "CPU Support List" for more information.)
Note: If the motherboard PCB is rev1.0, please must check “Support-> FAQ” for more information.

The entry in support FAQ whatever it was when that was shown, does not now exist
 
#21 ·
There is one final thought that comes to my mind
Have a look at the motherboard and check the revision number
If yours is the first of that motherboard generation
eg revision 1.0
That MAY be the problem

The version or revision numbers are printed on the PCB on all range of GIGABYTE's Motherboard. You can find the corresponding "REV: 1.X on the top left corner of the Motherboard. When you wish to update either bios or driver please make sure the correct driver or bios is selected to correspond to your Revision of motherboard.

Your board
GA-AB350-Gaming (rev. 1.x) Specification | Motherboard - GIGABYTE U.S.A.


  1. AM4 Socket: Supports AMD 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3rd Gen Ryzen™/ 2nd Gen Ryzen™/ 1st Gen Ryzen™/ 2nd Gen Ryzen™ with Radeon™ Vega Graphics/ 1st Gen Ryzen™ with Radeon™ Vega Graphics/ Athlon™ with Radeon™ Vega Graphics Processors
(Please refer "CPU Support List" for more information.)
Note: If the motherboard PCB is rev1.0, please must check “Support-> FAQ” for more information.

The entry in support FAQ whatever it was when that was shown, does not now exist
On my motherboard it says 'rev: 1.1 on the bottom left, but on the motherboard web page where I download the BIOS update it just says 'rev: 1.x' which I assume means all versions.
 
#23 ·
That is not the problem then
revision 1.1 is shown as 1.x on the site as would be 1.2 if there was one.
 
#30 ·
so what slots are they in now when going from processor - from which the slots are, as I said
numbered 4, 2, 3 and 1
 
#32 ·
If the numbers you mentioned are from left to right, the 2 sticks were previously in numbers 2, and 1,

That is correct
For optimum performance, when enabling Dual Channel mode with two memory modules, be sure to install them in the DDR4_1 and DDR4_2 sockets."
and yes the slots are as I said numbered from the CPU going from next to it to the right
slots are numbered 4, 2, 3 and 1 from CPU
and as I posted
Channel A: DDR4_2, DDR4_4
Channel B: DDR4_1, DDR4_3
so in summary YOU had one stick in channel A - slot 2
and one stick in channel B - slot 1

and now you have
they are now in 3 and 4.
so you still have one stick in each channel

I cannot find the manner in which the pin out of the cpu and socket control the ram in respect of each dimm slot
I therefore cannot say if it is possible for a bent pin, damaged socket to take out ONE slot

Clearly either slot ONE was working or
SLOT two was working - otherwise you would have not had any boot as if both had failed there would be NO RAM

I do not know how hard you find this to follow
I provided a link to your board on post 20
Here is a link direct to your manual
mb_manual_ga-ab350-gaming_e.pdf (gigabyte.com)

If it helps you see page 4 of pdf and page 9 and 10

THE TEST is to ascertain if it will work with ONE stick of ram in slot 1
OR one stick of ram in SLOT 2

IT will be SLOW but that will tell you if a slot is faulty
 
#33 ·
That is correct

and yes the slots are as I said numbered from the CPU going from next to it to the right


and as I posted


so in summary YOU had one stick in channel A - slot 2
and one stick in channel B - slot 1

and now you have

so you still have one stick in each channel

I cannot find the manner in which the pin out of the cpu and socket control the ram in respect of each dimm slot
I therefore cannot say if it is possible for a bent pin, damaged socket to take out ONE slot

Clearly either slot ONE was working or
SLOT two was working - otherwise you would have not had any boot as if both had failed there would be NO RAM

I do not know how hard you find this to follow
I provided a link to your board on post 20
Here is a link direct to your manual
mb_manual_ga-ab350-gaming_e.pdf (gigabyte.com)

If it helps you see page 4 of pdf and page 9 and 10

THE TEST is to ascertain if it will work with ONE stick of ram in slot 1
OR one stick of ram in SLOT 2

IT will be SLOW but that will tell you if a slot is faulty
OK so I did a test with my RAM, I left one stick in DDR4_4 (channel a), then placed the other in both DDR4_2 (channel a), and DDR4_1 (channel b). When the other RAM piece was in DDR4_2 (channel a) it loaded with 15.9GB of usable memory, the ideal amount really. However when I swapped it from that socket, to DDR4_1 (channel b) it only displayed 7.93GB of usable memory. Therefore it seems that DDR4_1 (channel b) is faulty, it detects the RAM as it says "16GB of installed RAM", however only 7.93GB is listed as "total" (usable). The only explanation for the slot being unusable is the cpu slot or chip itself being damaged, however my PC boots fine and there are no problems that I can see, I was also very careful when installing and removing the CPU. I just hope that DDR4_3 (channel b) doesn't get damaged otherwise I will lose the ability to utilise dual channel for my RAM. Thank you for the guidance for this.
 
#34 ·
Usually when the ram is shown but such an amount is shown as hardware reserved - the total amount of the ram stick, that indicates that there is a fault on the slot or a fault on the CPU ram controller

That is NOT always the case as a certain amount of ram is always hardware reserved for use by the firmware BIOS and certain drivers, but when the total of one stick is shown hardware reserved and ONLY when in one slot - it tends to indicate as explained in the first paragraph
 
#36 ·
Cheers
I am pleased that you have got it working, as I said

Usually when the ram is shown but such an amount is shown as hardware reserved - the total amount of the ram stick, that indicates that there is a fault on the slot or a fault on the CPU ram controller
and indeed other people suggested


It would indeed seem it was a fault on the cpu
I suggest you put your ram back in the recommended slots for the two sticks as per my post 32 and your reply post 33

Hope all stays good
 
#35 ·
UPDATE:
So I went and purchased the Ryzen 7 5800x from 'Overclockers' instead after returning the Amazon one, installed it today and vwallah, it worked! Didn't even need to clear the CMOS or anything. I'm so happy right now and I can't describe how ecstatic I was when I switched on my PC and the display, keyboard and mouse came on no problem, here's a picture of what it looked like below. At first I didn't know which key to press but I looked it up and it said you should press 'Y'. I can't thank you guys enough for your help and support through this ordeal and you were right @crjdriver the last one was definitely a dud. Once again thank you guys so much and I hope you have a great week! 😊.
 

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#37 ·
Once again thank you guys so much and I hope you have a great week!
Excellent! Glad you got it working!
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#38 ·
Please reply to my 36 before you mark it mark it solved
You need to test it with the ram in those recommended slots
It would indeed seem it was a fault on the cpu
I suggest you put your ram back in the recommended slots for the two sticks as per my post 32 and your reply post 33