If you know the make of your new hdd, go to the manufacturers website and download their diagnostics program. Install it on either a floppy or cd-r and use that to boot the system with.
Let it run. It will tell you if there are problems with the hdd.
Murray
I found the diagnotic program, and d/l it to my hard drive, but it won't open/install there
Can I install it on a DVD-R, that's all the disks I have, I don't have a floppy drive at all.