Firstly, use a utility called System Event Log Viewer:
This tool will give a report and sometimes you may find your answers in it.
You will need to create a USB DOS Bootable Stick.
More help how to create one: Go to the link:
Update the board firmware:
Before doing any update:
Make sure you identify your board correctly.
From the website, if you have a pba number starting with Cxxxxx then it must be the ddr266/333 else Dxxxxxx will be the ddr2-400 board.
What is the status of the warning led?
If the warning led is amber, it can be due to:
1. Wrong system fans are connected on the board.
2. Incompatible chassis and wrongly configured SDR.
3. Compatible chassis with a wrongly configured SDR
4. Hardware failure
Hope these are useful,