Duron and memory upgrade ... now no post

I've got an old system that I'm using for some CAD work.

The system is a Gigabyte GA 7ZX motherboard with Socket A for AMD Duron/Athlon processor; a VIA KT133/686A chipset, with support for PC133 SDRAM .

I did something very simple ---- I replaced the CPU Duron 900 with a Duron 1200 and I added a stick of 256 memory. I made sure that the CPU and memory pieces were compatible with the motherboard.

The machine will not pass the POST.

I took out the memory and put the old processor back in......no POST
I took all peripherals off line and added them one at a time.....no POST
I replaced the power supply......no Post
I replaced the motherboard with a brand new one exact model.....no POST
I pulled the video card and checked it.......no POST
I switched the new CPU back in.....no POST
I switched out the memory sticks one at a time....no POST

I'm stumped, any ideas.

try resetting the cmos battery as some of the older skt a boards used a ram save function and would not post after a ram upgrade and and wouldnt post unless the cmos was reset. This also goes for slotkit intels......


also is the ram matched? single sided or double banked and have you tried each stick alone? Because sometimes a stick might be dead and it wont boot with it in. Also run memtest 86

The board took a previous ram upgrad no problem, and the board manual states that any combination will work. I did swap out all of the sticks one at a time; still no post.

I haven't tried a Bios reset (pulling the battery I presume) as I've read differing opinions about the effectiveness. Might be worth a try.

try resettng the cmos battery