I posted about this previously and thought it was fixed. I got a laptop from a client, thought it was dead. It boots fine, shows hp screen, memory scan, bios, but cannot find any boot devices. No cd's or dvds, no hard drives (tried several different ones), no bootable usb sticks. Just messing around I threw in two hard drives from other laptops and it booted right up. Put the old drive back in and it boots fine, no issues, but there is occasionally a error in the logs: "Event 11, Disk The driver detected a controller error on \...\DR3" This would seem miraculously, except at random intervals, sometimes a few days, sometimes a week or two the problem occurs again. It is not always easy to fix either as it seems the trick is to have two bootable drives with operating system in them, pull the bios battery, unplug everything and unplug the ram. After this I reassemble and it usually works, but other times I have to try a few times or switch out the drives I used. This would seem to indicate to me a failing drive controller. It is just odd that it starts working again for a time. This puts me in a tough spot because I cannot sell it like this, and it is not extremely useful to me as if I'm traveling I don't want to have to carry a bunch of extra hard drives and screw drivers. This time I think I will try setting up another drive as its permanent drive and see if that makes a difference. Note that I have already reinstalled the OS (first vista, then windows 7 ultimate), checked error logs, switched out memory modules. Any tips or ideas are appreciated, thanks.