Computer randomly shuts down

kalingm

Commendable
Feb 6, 2017
4
0
1,510
Hello,
So recently I bought a new CPU (AMD A10-7700k) MotherBoard(MSI A88XM-E35) and ram card 8gigs. I used the old power supply, computer box and HDD.
From the very beginning the computer was suddenly shutting down, no warning, no anything, just all of a sudden shuts down. After it I had to wait 15-20 minutes in order to try to switch it on again, otherwise it was shutting down faster. Sometimes once a day, other times twice...
This morning I noticed that the LED on the box was lighting like the computer was "sleeping". Moved the mouse, pressed the power onbutton but yet, nothing happened. I unplugged the power, plugged it in and tried to switch it on, worked for 10 seconds then all of a sudden it shut down and again I couldn't tho anything until I unplug and plug the cable to the power supply.
What I tried already is the following:
Reinstallation of windows
Changing the operation system
Switching the RAM position
Taking the motherboard out, cleaning everything and plugging back in
Changing the CPU paste
Taking the battery out for 1 minute

The power supply is quite old, CORSAIR 750W, from what I've read I found out that this is from where the issue is coming probably.

The computer didn't switch off even once while I was playing a game. Also the computer has no video card and it is with the stock cooler still.

Any help will be highly appreciated.
Thanks in advance :)
 

kalingm

Commendable
Feb 6, 2017
4
0
1,510
The temperatures weren't higher than 50-60 degrees. But the thing is that the whole night the computer's LED was blinking, but nothing was responding before I unplugged it from the grid. As soon as I switched it on, the temperature increased to 45 from 20 while only on bios, which was weird...
 

kalingm

Commendable
Feb 6, 2017
4
0
1,510
Also I forgot to mention that this CPU is APU (something that I didn't read enough online about before I purchased it) ...

APU is basically a CPU + not bad video card in the same chip.
Update:
Tried to switch the computer on after 20hours being off the grid, worked for 3 minutes and switched off again at the same way without any warning. Any advices please?