OK... tested the Biostar MOBO with the old PSU and the same thing, so that rules out the PSU in the Antec case. I am RMA'ing the Biostar MOBO for refund and getting a new MOBO today, probably a Gigabyte in the $100<price range. When the new one is installed I will update this thread. Thanks...
I have not swapped anything, the PSU will not power the new board as it is missing a 4 pin dongle that would hook into the slot with the main power cord. So, it looks like I will have to RMA the MOBO and the Case as it came with the PSU.
AMD athlon 64 X2 4800+
Seagate Barracuda 7200 500GB
BFG 8800GT OC512MB
Antec Sonata III Case w/ 500w PSU
Corsair XMS2 twin 2x2048-6400c4 2GB ram
Win XP Home SP2
Biostar TF7050 M2
When first assembled, the rig worked great...
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