How do i know which component is faulty in my PC

tananurajkumar

Reputable
Aug 16, 2014
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Hi,
I built a custom Pc last year
It worked fine of 8-9 months but few months back it started to shut down abruptly

Last night when it shut down even the pc power button failed to start it, i thought its gone for good now but it worked fine when i turned it on in the morning

Now i have no idea what's causing the problem...
My motherboard or the Power supply ?
How can i pin point the component causing the problem?