Pc turns on, no hdd light, no video. Fans turn on but nothing happens.

[Brandonthe1]

I received a custom built pc from my uncle and it worked fine at first, except every once in a while it would just turn off and restart. Then it started to always do that on the first boot( i would turn on the pc and it would turn off after like 5 min, no problems after that), now it wont even turn on, this had happened a few months ago and i got very frustrated so i called quits and unplugged everything (left it like that for about a month) then for whatever reason I decided to turn it on and see what happens. Then surprise everything worked and I had no problems, well now i am and i am trying to figure out what's wrong. Here's what i have done so far: Cleared the CMOS, took out the gpu and reinstalled, took out the ram and reinstalled, plugged all the wires out and back in. I have no idea what else to do, someone please help.
Specs:
MOBO-Intel DX58SO ATX LGA1366
CPU-INTEL CORE I7-EXTREME EDITION
GPU-GTX 8800
WINDOWS 10

 

[Gman450]

Could you take a look at the temperatures of your GPU and CPU?
High temperatures could cause the CPU to automatically shut down the PC. Or it could POST related issues.

I'm also currently facing a similar issue but mine is related to the motherboard.

 

[slyverine]

it could be your PSU, it may be defected. You can try with another PSU.

 

[Brandonthe1]

Well i suspect that it is the ram because before the pc stopped completely working i got beep codes caused by the ram.

 

[Gman450]

You've got multiple sticks of RAM?

If you heard beep codes then definitely it's a RAM issue. If you have a spare you could try plugging that in.

 

[Brandonthe1]

Update: i have just bought ram and i still have the issue. What should i try next

 

[Gman450]

Like Slyverine suggested, you could try out another PSU.