computer won't boot at all...please help

when i put hard drive in..it goes back to black screen with flashing "_" ..the only time computer works is when hard drive is disconnected...i also tried switching cables (ide)...and jumper settings..and had no luck..
 
could i try..disconnecting hard drive...booting up computer via xp cd...then plugging power cord back into hard drive?without restarting?
 
it is the hard drive for sure...i disconnected hard drive..and works okay, except no OS installed..lol... i guess i can run Linux such as ubuntu live CD..hopefully i can find a cheap hard drive no smaller then 20gb...the hard drive was only 6 years old... :( .....it would be awesome if someone was able to give so more ideas to try.... i still think something with master boot record...someday when i get time, I'll hook it up to another computer as slave.
 
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