PC Wont Start

Hello
My Pc (homemade desktop) wont start propely. . Just awesome the day Deus Ex is realesed xD. I hit the power button, everythings turns on, but nothing external gets a signal to the PC; monitor, mouse, keyboard headset. I can hear a fan that is "restarting" inside the PC.

I have tried reseting the BIOS by removing the battery. This is the third time this happend, but I have always handed it in to repair, but I am kinda tired of paying 70$ and the repair dude doesnt want to explain how he fixed it :P No new components for 6 months, and the PC is around 1 year old

The problem seems to arrive after I have left the PC in the car for a few hours.

Specs:
Windows 7 Home Premiun 64 bit
8 gb Ram
HD6950 (flashed to 6970)
AMD Phenom X6 1055T
SSD 120GB
Gigabyte 790fxta-ud5

[QUOTE=Dudex;1553114]Hello
My Pc (homemade desktop) wont start propely. .

The problem seems to arrive after I have left the PC in the car for a few hours.

At first glance, heat related, but that would be to easy. Had similar problem about a month ago and typically I remove all external cables. Remove all internal cards except the graphics card and remove all memory chips except one. Rotate that memory chip if problem still occurs. Go into bios and do the default settings next and if so equiped, select the option to halt on error. This prevents the puter from starting over and over again on error. Do the case fans power up, how about the power supply fan start up. Post back. p.s. my problem was one of the memory chips went south.

I am unable to get into BIOS the bios. The monitor wont get a signal. And yes the fans start up. Sry for late reply, but when I made the first post it was 2am at my place :P

Ok I just treid to start it up after have left it to rest for like 16 hours and now it worked fine...