The error is often encountered during updates when the updates fail or on older systems - the windows update causes problems with hardware and drivers that were not compatible with 10
However the blinking of the power light suggests that there is either a power error or the computer is now trying to wake from sleep
As a first step,
disconnect all external devices except monitor keyboard and mouse.
disconnect power cord, hold down power button on tower for a full 20 seconds
Leave any external drives, usb drives, printer etc, disconnected
reconnect power and try to power up.

If that does not work I will give you the next step when you reply

 

Hi thank you for your response. I have tried the steps you suggested & also found a loose ram chip which i secured. Now the green light has stopped flashing & the computer seems to have powered up however im not receiving any signal to the tv I use instead of a monitor. It was working away this morning as normal & I can hear the hard drive & fans etc working but I know have the message on my screen saying no signal through pc using the same vga cable I always do. I have plugged in my keyboard to attempt to wake up the computer however the keyboard doesn't seem to be working with it. I'm at a loss as i have work to do (im a journalist) any further help would be appreciated thanks

 

And now the green light has started to flash again

 

My daughter in law has fixed it, she put a new hand drive with windows 10 in & I'm going to reinstall all my software. Luckily I have published most of my work unfortunately I have lost a LOT of press released & personally sent from bands albums & EPs have been lost. These were precious to me, so could I ask for your help one more time please? Could you tell me if there's any way I could recover the data stored on my hard drive which failed to start?

 

It is very unusual for a ram stick to become loose, unsecured in its slot
and then the drive problem
has the computer had some form of knock, severe jolt or somehow fallen over

Recovery of the data depends on what the damage or coprruption is to the drive
Is it a spinning hard drive or a solid state drive
On an aside note with such vital data it is imperative to maintain a backup on an external drive connected usb

 

I looked around at data recovery software & when i found one i was happy with (Stellar Data Recovery,) I ran the program, scanned the drive & then managed to recover about 85% of my data. I went out a walk earlier out of frustration & after the new hard drive was installed & Windows 10 was installed I was clear minded enough to research data recovery on corrupted hard drives. Knowledge gained & my new hard drive is running like a champion. Thank you for your time & assistance,

Jojo

 

Cheers