This could possibly be a memory problem. So I googled for Asrock memory problems and found this:
"With all these good features, it's maybe time to mention some of the shortcomings of this interesting board. First, there are 4 memory sockets on the board, two for DDR and two for DDRII. You can use only 2 of them at the same time and with the maximum supported DIMM size of 1GB it sets the maximum amount of supported memory to 2GB."
http://www.linuxinsight.com/running_...therboard.html
If you have memtest available on an install CD I suggest that you run memtest.
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Steve Stites