Possibly a case of loose power/data cable/connection. A computer will freeze if you unplug the hdd power or data cable. Or your power supply could be inadequate.
If you are not sure of your mobo model, download cpu-z ( http://www.cpuid.com/cpuz.php) and use your new found kowledge to flash with the right bios.
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http://myxp.blogspot.com
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Winchester 3200+ @2,500MHz
LeadTek 7900GT VOLT MODDED @ 680 core, 1800 mem
2x1GB Transcend DDR400 @ DDR454 2.5,3,3,5,1T
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