|Normally a clue of an ESD damaged device or possibly a power supply issue. |
I might consider removing any pci cards and the minimum ram. Set bios settings to fail safe or default if option. Then run a diag suite. Could start with memory tests. If runs then try the machine like that. If works then add in boards and memory.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10