Computer will boot up only after clearing cmos with jumpers. It will run fine after that. After it is shut down if it is not turned back on in a few seconds it will not boot up. It is a new motherboard and the battery is good. It will give a checksum error when it does come on. I have tried a different video card and that doesn't help. Could it be the power supply? Please help!

Clearing CMOS with jumpers? Did you put the jumpers back to where they were? And just out of curiousity, why did you clear CMOS?

Originally posted by lamier:
Clearing CMOS with jumpers? Did you put the jumpers back to where they were? And just out of curiousity, why did you clear CMOS?

This is the only way to get it to boot up. Yes I return the jumpers back to normal position.

I had a similar problem a couple of years ago. Turned out I had been sold a "refurbished" motherboard that still had somebody else's hardware config in the BIOS. Hard reset (pulling the jumper) won't work if the BIOS has already dumped its data into the CMOS' NVRAM (or ESCD). The only place I've ever seen that offers a software utility to clear your ESCD (all of it), is Gateway. The link to the utility is:

ftp://ftp.gateway.com/pub/hardware_support/bios/pentium/clrescsd.exe

I've heard that you can force the BIOS to reassign all the IRQ's at once by physically moving all of your cards to different slots, but I've never tried it. Good luck.

CMOS checksum error means CMOS has found faulty configuration. Go into BIOS, check everything and reset anything that's out of order, or set performance defaults, then re-check hard drive and floppy parameters, save changes, and try it.

Write down any changes you make, and try to make them one at a time, except for drive parameters, so if you have problems it's easy to set it back.

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