it powers on initially for a few seconds, then abruptly goes off for a few seconds, then back on but it never boots. ( black screen) with the lock buttons flashing in unison. Power led is lit, and the disc led flashes ever so briefly. that's it. Checked the ram, it's seated and locked. Don't hear the fan running either... ugh, hope it's not the motherboard. I just replaced the drive a few months ago.