PC will not POST

[rtc1036]

I recently RMA'd my Asus A8N-SLI mobo after an issue with my system not posting at all, I thought it was a mobo problem. I installed my new mobo today (same type) and the system still will not post. I get to my ASUS splash screen where it says hit DEL to enter setup and it locks there and nothing happens at all. I cannot even enter the BIOS.

I've removed all my hard drives, disconnected my CD/DVD drives, removed all but one stick of memory (swapping it with the others to ensure it was not bad), and removed my sound card and one of my video cards in an effort to locate the problem.

Because this is the same exact problem with the other mobo, I did not bother to reset the CMOS cause I tried that last time. I'm thinking my CPU is defective, but how can I tell. I don't have an extra AMD 64 bit processor laying around. Should the consensus be that it's not my CPU, what should I be looking at? Thanks in advance.

 

[hardcandy2]

You have the 4 pin power molex connected to the MB? Probably a black and yellow cord.

 

[Scott66]

There seems to an issue with SLI and even just high end single cards where the power supply thinks it is going into overload because of the high wattage being drawn on the 12 volt line when compared to the 5 volt line. Some power supplies can't handle the load imbalance and do not provide the power to the MB because the PS stops fearing an overload. Was listening to last weeks Extreme tech podcast and they discussed it.

This means the usual procedure of disconnecting all non essential devices to check power may make the problem worse since HD and CD/DVD are mostly 5 volt devices

 

[mechBgon]

Welcome to the Forums rtc1036 If you list your system's specs, part by part in full detail, that'll probably help. Include the brand & model of the power supply, drives, cards, RAM, everything.

With the A8N-SLI, make sure you've connected the EZ-Plug as well as the ATX12V cable. Also, just a long shot here, but confirm that you have the mouse and keyboard plugs in the correct PS/2 ports. The mouse goes in the green one (although most mouses are USB nowdays, not PS/2), and the keyboard goes in the purple one.