Liquid cooling does not last forever; pumps fail, coolant leaks, etc. If the cooler is 5yr old, it has lived its useful life. Replace it.
I assume you have already checked connections ie pw source for the pump, etc.

 

Thank you very much for your reply crjdriver!

Ignorant as I am, I did not know that I had liquid cooling. I checked connections and everything seemed correctly plugged in.

Do all liquid coolers fail after a few years? Could you please recommend an alternative to replace my cooler? I suppose the fans that came with it have become useless, correct?

 

I suppose the fans that came with it have become useless, correct?

No, you could use them as case fans.
I use and recommend either corsair or coolermaster liquid cooling.

Do all liquid coolers fail after a few years?

Nothing lasts forever. Even air coolers fail eventually.
Currently I use this liquid cooler. It works well with no problems. In any case IF you decide to go with another liquid cooler, make sure the case has enough room.
Corsair Hydro Series H115i Liquid CPU Cooler, 280mm - Newegg.com

 

You could use them as case fans.

In any case IF you decide to go with another liquid cooler, make sure the case has enough room.

Alright, thank you.

There is one thing I do not understand however. Can the CPU really attain a temperature of 85-95°C less than five minutes after booting? Could there be an issue with the motherboard?

Also, why does the video output not work anymore?

 

It can get to that temp in seconds. In the way old days, I used to test motherboards without a cooler attached to see if the board would POST. That is no longer possible. Modern processors will overheat in seconds.

 

Hello again, today I bought thermal paste and a new CPU cooler at a local shop where I was advised to try the old cooler again by applying fresh thermal paste. However, that did not help to boot the computer at all. Instead, the fans of the CPU cooler no longer spin abnormally fast and the temperature/code dial inside the case indicates "00" , but the Corsair logo still flashes red. The monitor still displays a "No HDMI/MHL" signal.

According to the vendor, that means that the CPU is fried.

I have not unboxed the new CPU cooler yet, so I can return it if need be.

I would very much appreciate your (or somebody else's) opinion on the matter, crjdriver.

Thank you.

 

Your old cooler failed. I am at a loss as to why you would attempt to use it [unless there was something wrong with the mounting]
As to the processor "frying" while it is not impossible, all modern processors will throttle to maintain temp ie it slows way down. I would suspect the motherboard before the processor.

 

The problem you are going to run into here is that you dealing with hardware that is going on 7yr old. If you have a motherboard or processor failure, it is seldom cost effective to repair obsolete hardware. I doubt there are any new motherboards available and you would have to go used from ebay or amazon.

 

Hey, thanks again for the quick response. Alright, so the cooler failed. But if you also think that the motherboard or processor may be damaged, I hesitate to replace the cooler.

Information technology is not my forte, so pardon my difficulty to understand everything. Why should I use an old motherboard or processor in case they are the issue?

What is worth keeping from my computer? The GPU, power supply (Seasonic P860), RAM and drives?

My main problem is that I am in state of urgency where I need a decent computer for work from home (i7 or equivalent processor, at least 8gb of RAM). I am even considering buying a laptop tomorrow...

 

You know that something failed and the only way you are going to find out what failed is to swap parts with known good units.
A new liquid cooler can be used on a new build and your video card is still quite usable. The pw supply can be used again if it is not too old. Just like any part, a pw supply wears with time and use. Seasonic makes very good pw supplies however if this is more than 6~7yr old and has been used regularly I would consider replacing it if you are considering a new build.

 

Thank you very much for your help, crjdriver!

 

Hello, I wanted to send a follow-up. I eventually replaced my old cooler but kept seeing an "HDMI/HMS no signal" blue screen when booting. The technician at the shop where I bought the cooler later diagnosed a failed processor. I now have a new one and also replaced the motherboard because of an incompatibility with the new CPU. I was able to reactivate Windows 10 easily. One issue that I still have, is the short beep when I boot. Other than that, the computer works fine.

 

A short beep when you boot is the POST (power on self test) and is perfectly normal.

 

You only hear that short beep if there is a speaker/bleeper connected to the motherboard, you probably didn't have one with the old motherboard but you do now with the new one.