Tell me about your system. I have just got the bugs worked out of mine. Maybe I can share some troubleshooting tips with ya. I have an Athlon 800, Abit KA7 mobo, (2) 128mb sticks of PC133 ECC Crucial SDRAM, Maxtor Diamond Max 30gb hd. etc, etc, etc... Mine was RAM location, I/O Voltage and Core Voltage setting issues.
Update: move the RAM to other slots. Check the I/O Voltage settings. I had to up mine one notch in the Soft Menu settings. Also make sure your core voltage is correct. If your not using a monitoring software, try one. the mobo usually comes with Hardware Monitor. SiSoft Sandra will do this also.
Firefly