Newly built PC wont boot!!!!

[jcmkk]

I was helping my uncle upgrade his Athlon 900MHz Classic. I upgraded it to a Pentium 4 1.6A with a Asus P4B266-C, and 256MB of Samsung memory. I'm almost certain that I hooked everything up right and checked all of the jumpers to make sure they are in the right position. I actually have it set up outside of the machine since the motherboard doesn't fit in the case right. I have a 300W enlight PSU running it. When I hit the power button, it looks like it boots fine, but there is no signal sent to the monitor. The monitor stays in sleep mode. Does anyone have any idea why this is happening?

 

[John]

Did you plug the special 4 pin w/ catch +12v lead or 4 pin molex lead from the powersupply to the motherboard?

[*]Reset cmos
[*]Pull out all expansion cards except video
[*]use only one stick of ram
[*]disconnect HDD and CDROMS

What happens now?

 

[Pabster]

Which video card are you using with it?

 

[jcmkk]

I haven't cleared the CMOS yet, but I have done everything else you suggested. I have tried an AGP GeForce 2 Pro and a PCI GeForce 2 MX. Thanks for responding so fast and keep the suggestions coming. I'm gonna clear the CMOS now.

 

[Syps]

Have any way of checking to make sure the ram and processor work? I was troubleshooting for like 10 hours on my new AMD system, then I realized the processor was dead.

 

[travler]

this happened to me once.

my advice is to wiggle stuff. hehe worked for me

that box has been running stable ever since

 

[Bovinicus]

Hrm... I would say completely take the system apart and rebuild it. You would be surprised how often that helps. That would have fixed problems for me before. A wrong connection or something can wreak havoc. Even an improper power connection to the floppy drive can prevent proper booting. Trust me I know.