I have a used Panasonic CF-29. It came with a SATA upgrade and a 80GB hdd. A couple weeks later it stopped booting saying "Operating System Not Present" and the bios wouldn't show anything under Master IDE so I thought the HDD had died. I swapped in a small SSD (128GB) and installed Ubuntu from a live-usb. EXACTLY the same thing happened "Operating System Not Found"
I've traded the SATA adapter, ditto on both drives.
The weirdest part is that no hdd ever shows up in the bios but will be visible later as a partitioned disk when I view it with Parted in Ubuntu. I can format and install Ubuntu to the disk but upon rebooting the same error appears.
Any ideas what could possibly be going wrong?