My selfbuilt computer randomly turned off and won't turn on again

nlarmann

Honorable
Nov 26, 2013
2
0
10,510
I built my own computer and while i was playing League of Legends, it just turned off and won't turn on again.
The components are :

-Z87-A Socket LGA 1150 ATX Intel Motherboard

-HX Series HX850 850 Watt ATX 12V Modular Power Supply

-ReadyCache SDSSDRC-032G-G2 32GB SATA 6.0Gb/s Internal Solid State Drive (SSD)

-Barracuda 2TB 7,200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive STBD2000101

-HyperX blu 8GB DDR3-1600 (PC3-12800) CL9 Dual Channel Desktop Memory Kit (Two 4GB Memory Modules)

-Core i5 4670K 3.4GHz Socket LGA 1150 Boxed Processor

-Two Radeon HD 7950 crossfire

The SSD is only for boot-up, im not sure if that is important but I'm just going to give as much information as i can so i can solve this problem sooner.
I am going to replace the thermal paste but it doesn't look to try except that some areas of the cpu aren't covered with it. After the computer turned off i checked the power supply which wasn't even really warm. Also the light that shows that the motherboard has power is also on, so i dont think its my power supply.

Please give as much advice as you can, because it was a very expensive build, i saved up a lot of money and worked a lot during the summer just to build it.
Thank you.

Update 1:
So I tried some stuff. Basically the computer wont turn on with my two GPU's plugged in. After i take out their power source it wont turn on until i remove and insert the RAM again. I've asked my friend who is experienced with computers and he said that this is just strange. Btw both GPU's are MSI.

Update 2:
It will boot with the GPU's unplugged and run on the intergrated gpu.
But as soon as i plug in the GPU's it refuses to boot. To be clear by refusing to boot nothing turns on. I know that the motherboard is getting power because of a light but when i hit the power button no lights turn on and no fans turn on.
 
Solution
Basics 101: Take the entire system apart (sorry you need to at this point).
Take Mobo place on piece of wood (old school breadboard but it works)
Reseat CPU, 1 stick memory, you have onboard video, and connect to the case Power switch.
Reseat and confirm FIRM seating of the PSU connections to the Mobo. Turn on, what do you get?

IF you see power coming to the Mobo (the light) but nothing kicks on (no CPU fan/no BIOS/No beeps), turn off and unplug power. Remove the battery backup (watch battery) for BIOS. Wait 15 min. Plug battery back in and then power. Switch on, what do you get?

If still not even the fans coming back on more then likely the CPU/Mobo is DOA. You can try testing as follows then:
Swap Memory for other stick, any...
Basics 101: Take the entire system apart (sorry you need to at this point).
Take Mobo place on piece of wood (old school breadboard but it works)
Reseat CPU, 1 stick memory, you have onboard video, and connect to the case Power switch.
Reseat and confirm FIRM seating of the PSU connections to the Mobo. Turn on, what do you get?

IF you see power coming to the Mobo (the light) but nothing kicks on (no CPU fan/no BIOS/No beeps), turn off and unplug power. Remove the battery backup (watch battery) for BIOS. Wait 15 min. Plug battery back in and then power. Switch on, what do you get?

If still not even the fans coming back on more then likely the CPU/Mobo is DOA. You can try testing as follows then:
Swap Memory for other stick, any change? move the memory around, any change? Then the memory probably is good, but would need to be tested in another PC to confirm (or memory tester).
Unplug CPU, and power the board, you should get a immediate beep error (some Mobo makers cause the board not to work at all, so this is a hit or miss) and immediate shut it off. If you still get nothing then to eliminate the CPU you have to test it in another PC (or a CPU tester).
Most likely at this point it would point to the Mobo. You can RMA any of these components if still underwarranty, but ultimately the testing of any of these is to have a second copy of the hardware you know is 'working' to test which component on your PC isn't.
 
Solution

nlarmann

Honorable
Nov 26, 2013
2
0
10,510


SO after all this hard work taking about 3 hours out of my day it turns out one of my GPU's is broken. Guess that could help people who have this same issue. Thank you for the response though.