[Puzzdre]

My MSI gave me similar problems when I installed wc to it. I had to 'walk' memory stick through the slots (yes, I cleaned it first with pencil eraser) until it worked.
If you cleared the cmos, its possible that you'll have to hook up a fan on the cpu fan connector, try to boot, then disable the cpu fan checking/alarm in bios if possible (MSI just plays alarm sound when cpu fan is not present, but posts and you can disable the alarm in bios).

good luck!