Also go into BIOS and switch the boot order to HD 1st, CD ROM 2nd.
If you have a way to do it, such as a DVM, I would also check the stability of the power supply. Raidmax is not known for qualit. You could also go into BIOS and watch the voltage there to see if it fluctuates a lot.
A flaky power supply can cause a computer to do strange things.