I presume you were supplied a CD that had the original setup (OS and the supplied software) ? This should be a bootable disk. Alternatively a bootable floppy disk can be made, and you could try to access the HD after booting.You might have get into the BIOS to change the boot sequence to avoid the HD.

Alternatively, take it back to where you bought it and they should have a bootable CD you could use.

There could be many reasons you are having the problem and it's probably not possible to go through a fix in this medium!

Good luck though!

-David C.