Before initializing the O/S, the Abit runs a series of tests to ensure that your mobo is functioning correctly. It will count from "00"/"0.0" to "90"/"9.0.", and if all went well, the post code will return to "20"/"2.0." (basicly meaning it is idle).
uGuru is the built in processor chip which is dedicated to monitoring the temperature of hardware, etc. so that it does not have to take up any of your CPUs resources.
If your post count stops at "90"/"9.0" then there was something wrong with the uGuru initialization. First, I would recommend switching the power off (on the psu). Wait a few seconds for the mobo to loose its power (lights on mobo (power indicator) should turn off), then unplug it. Remove your hardware, and reinsert it carefuly.
Clear the CMOS (using the jumper on the mobo), and boot into the BIOS. First check the temperature of your hardware. If the temperature seems off (too high or too low), you must recalibrate the temp sensor by updating the BIOS. The majority of Abit's temp sensors were not calibrated properly during manufacturing. They have now fixed the issue.
If everything looks ok, proceed to reconfiguring your settings.
If you still get the post error code ("90"/"9.0"), then try disabling the process through the BIOS.
If you have any further questions, let me know! I'll respond as soon as I can!