[SOLVED] Is it the mobo or the cpu causing the problem

[abdallahrida21]

Hello guys,
Today i had a sudden problem with my pc that was working perfectly yesterday.
When i try to boot it up fans of psu and cpu work for 2 seconds but with no beeps and then shuts down and tries again on it's own and so on
Here's what i tried
1- changed the psu and the problem persists so excluded the psu
2-changed the mobo and cpu and rams with old ones that i have and voila there are beeps and signs of life so excluded hdd problems
3- couldn't change cpu only but re installed it with new thermals and problem persists
So i really don't know whether it's the mobo or cpu
Thanks in advance

 

[alexoiu]

Hi, If removing the CPU power cable and starting the board, do case fans spin?

 

[abdallahrida21]

Thanks for replying
I'm not quite sure what is the cpu cable but if u mean the one named atx 12 volts so i tried pulling it out and turn on the system and everything is the same
But i tried clearing the cmos by the jumper and it surprised me that it beeped and entered the bios but i wasn't connecting my hdd so i turned off the system , connected the hdd and booted it and problem came back
It's like the system needs more power and when it's not getting it it shuts down

 

[alexoiu]

What motherboard using?

 

[abdallahrida21]

Mobo .. h61
Cpu .. i5 2nd gen
Ram.. 2*4gb

 

[alexoiu]

Try starting the board with single RAM module installed, graphics card removed, and see if working.