As the title says, I just got a higher rated PSU in order to run a better graphics card. Despite working fine before, the HDD connected to the sata cable will now boot, and is not found in the BIOS. I have reset the cmos, bios factory settings etc to try to find it but to no avail. All voltages in the BIOS are great, and I can boot from the (not sata) cd rom drive fine, so the PSU seems to be working well. I figure the make of the mobo isn't important for this since I know it works fine with the HDD, but the HDD is a Western Digital caviar black (WD5001AALS).
I figure it isn't getting power since it doesn't spin up at all.
Edit: the red light comes on when i power on the pc and stays on. Unfortunately the case for my pc is really old and the beeper doesn't work, so I cant' tell if it is beeping.
Considering it is plugged in in exactly the same way the old PSU was (they are literally exactly the same model, Vantec ION 2) but the new one is 620W instead of 480, I dont think that there is any problem with the connectors... although the HDD is strange in that it has two different types of power connectors.
Exactly how should I proceed to work out what the problem is?