By "image a certain computer" - do you mean "create an image of the computer" or "deploy an image to the computer" ??
Is this computer one of a kind in your organisation, or are you successfully imaging other identical models? (Identical bios and hardware)
If this machine is one of several, and is the only one not working, are you able to swap the hard disk with another working machine and see if this makes any difference?
Does the error occur immediately or after imaging has been running for some time?
What computer are you having problems with? Does it use a SATA or IDE hard disk? Is it a brand new model or an older model ?