I've heard of asrock mobos, i think the model you have must be P4i65GV though, not P4i656V!
The problem is, it sounds like you haven't done a fresh install of XP after you replaced the mobo etc. XP STOP error 0x0000007b means that the boot device (primary hard drive) is inaccessible.
First to do though is to check the BIOS settings and make sure that it has recognised your hard drive correctly. The drive must be set as the primary master. If its on the secondary channel, plug the ribbon cable into the other port. If it's set as a slave, check the jumper settings on the HDD & make sure HDD is at the end of the ribbon cable.
If all this checks out, try booting XP in safe mode and let it install the new mobo drivers. This may or may work. You will probably have to format the driver and do a fresh install instead.
If you still have problems, try reading the mobo manual or checking out asrocks website (www.asrock.com
) for any issues with XP