Have you got one of those little brass motherboard monting screws in the wrong place, and maybe its shorting something out?
BTW a thread description a tiny bit more detailed than 'PC Problem' would probably be appreciated by quite a few people.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
An overview: What leading creative agencies are doing to improve diversity
New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.