Typically, if there was an issue with the memory and battery, you would be able to enable RAID in the BIOS - you would just get an error message about the memory/battery state.  A bad RAID key would prevent the system from being able to enable RAID, and since the actual processor/logic for RAID is on the motherboard, if the key was ok (which it rarely fails), then the motherboard would be the most likely culprit. In order, the most likely: Obviously, it is cheaper to try the other components, but they are less likely to fix it.
Hello all, Having trouble getting RAID to show on post. Went to BIOS and can't select RAID in "Integrated Devices" only SCSI or OFF. Tried reseating the RAID memory and key. Battery has over 4v in it also. What am I overlooking. Thanks in advance for your help...
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