ECS beep codes

Can anyone decipher the beep codes when my computer fails to post? I have an ECS 755-a2 w/ AMD 2800. The computer had been working to the point that I could install XP, but it would reboot half way through installing SP2. I tried to update the driver in my video. It rebooted before completion and now it won't post. I get a continuing seriesof long beeps now. At one point I got along beep and a series of short, higher pitched beeps until I cut the power.