Computer Won't Boot?!

[SithNinjaTyler]

My computer:
ASUS CM1630
AMD Athlon X2 220 cpu
Nvidia Geforce 610 gpu
8 GB ram
750GB hard drive
Windows 7 Home Edition

Will not turn on. No matter what I try!
Turning on without hard drives and/or DVD RW drive, unplugging it for a while, turning on without gpu, testing mobo battery with multimeter (works), unplugging mobo power source connections, 2 different monitors (1 VGA, 1 HDMI), and no startup screen. Turns on, fans spin hard drives move, etc., but no screen to ask me to setup bios, resume, or anything else! And each time to turn it off, I must hold down power button. This is a SERIOUS problem! Help as soon as possible!

 

[KryssNova]

You checked your PSU?
I think that could be the reason.

 

[SithNinjaTyler]

*psu

 

[SithNinjaTyler]

You checked your PSU?
I think that could be the reason.

What is the pus and how do I check it?

 

[SithNinjaTyler]

I checked the psu and it works fine. All the fans turn on, lights turn on, sata devices, USB ports, power is supplied to the VGA cable, etc.

 

[KryssNova]

You checked your PSU?
I think that could be the reason.

What is the pus and how do I check it?

PSU is Power Supply - it could be faulty.

Well otherwise, try to clear CMOS or removing the BIOS battery for 1-2 minutes.
(you can find on Google, how to do that, if you don't know what I mean)
That didn't work, try running with 1 stick of RAM (if that don't work, try the other RAM)
still that didn't work, maybe shorted circuit on motherboard, check if any capacitors on it didn't blow up.


Try all this too:
http://www.tomshardware.co.uk/forum/261145-31-perform-steps-posting-post-boot-video-problems
(you can skip the parts about buying stuff and checking your CPU, for now).


I still think it's a problem with PSU or Motherboard though.
*If the CMOS and 1 stick of RAM doesn't help that is.