The Checksum Error typical means your CMOS battery is dead. Replace it.CaysE's advice bears repeating - it's a free five-minute job if you have a spare known good board around, and it might be causing the problem.
Sounds like the RAM though, although I don't know why it would work with the Duron...
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AXDL2600+, 11x202 @ 1.6v OCCT stable | EPoX 8RDA3I+ Pro | 1x512 MB Samsung TCB3 2.5-3-3-9 | Sapphire Radeon x1600Pro/256 MB | WD1600JB IDE | Enermax 420w | Ultra Aluminus
sA+ - Getting the most from older hardware