System Works Fine but only after Very Long BIOS POST Times?

System Works Fine but only after Very Long BIOS POST Times?

I built this AMD XP64/XP32 system in November 2008. It runs well, but it does not start well. Windows Restarts are fine, but cold starts average 4-5 minutes to POST, with the record-holder so far being more than 48 minutes. I have had a number of 20 minute-plus POST times.