I don't know anything about your particular accelerator - but I'd suspect the memory's at fault.
Try re-seating the RAM module(s). If there's no improvement, then try different RAM modules. If still no joy, then try removing as much of the hardware add-ons as possible and reboot. If all's ok, then install the add-ons one at a time until it fails. Hopefully this will identify what hardware, driver, or WHY that's causing the problem.
Be seeing you number six.
