Evidently we had a power failure today while I was gone from the house. My kitchen computer had a disk in the A drive when it happened. Now the computer won't boot up and the message I get says: Non-system disk or disk error, replace and strike any key to continue. Even though I have removed the disk from the A drive I still keep getting the same message. I have restarted the unit several times. I don't have any kind of recovery disks in my possession. It is a Compaq running Windows 98. Pentium 4 processor. Right when I restart I do get a quick message that says PXE-E61 media test failure. This is before it goes to the black screen with the disk error message. Any ideas?