Disk Error

sounds like the HD is about to completely fail or ribbon cable knackerred.
You are lucky you are getting a warning! backup your data urgently.
Double check the ribbon cable between HD and motherboard is secure if it was then replace it or test with a known good cable. If there is still a problem then replace HD. But whatever you do - do it soon!

Not 100% sure why it works after 10 mins - could be due to controller error or HD not responding first time to power.

When you start your computer, do you hear the drive actually spinning up? Anyone remember the sticture problem with seagate HD's? I agree with lumberjack you'd better backup your data.

First take a Backup of importent files.Remove the HDD data cable, clean dust if any on Mother board or at IDE connectors,connect with new data cable. After booting, scandisk and run surface Scan.

battery?

Backup immediately and download the disk utility from your hard drive manufacturer to test the hard drive.

Back up what you don't want to loose from that drive.

If you are lucky a reformat will clear up your problems. If not then,

The drive is starting to fail. When it finally goes it will go big time.

Then you will be trying to freeze it, or dropping it, or chanting over it while burning incense.

Good Luck Lee