External Hard Drive not recognised after horrible crash and reformat.

There's yet another problem with my MBP.
First of all this happened: http://discussions.apple.com/thread.jspa?threadID=969838&tstart=0
Since I got it fixed I bought a 500GB Freecom external Hard-drive and used it to back up all my stuff. It was a case of plugging it into the USB port and it mounted on the desktop. I've had it for about a month.
I've only just got my MBP back from getting the keyboard replaced, then on Saturday night it crashed. And kept crashing. Then it wouldn't boot. Then it crashed when booting. Then it took me to a command prompt. I reset all the parameters laid out in the troubleshooting guide. I managed to boot in safe mode, but my Freecom drive wouldn't mount anymore. But it kept crashing and crashing. I finally managed to boot from the installation CD and I reformatted the drive and installed OS X (Tiger) afresh. But now my Freecom drive won't show up on the desktop at all!
I ran a Hard Ware test after the reformat, and the code 4MEM/2/40000000 came up, then again, 1FCA8574, then 41530574.
When I had the Freecom plugged in it would show in System profiler but not mounted on the desktop.
What is wrong? I am really annoyed because my Warranty ran out yesterday and I'm only after getting it back from Apple to get the keyboard replaced!
Please help!
(PS - I have Leopard on its way to me, would installing this help?)

(PS - I have Leopard on its way to me, would installing this help?)
Not likely with all the bugs and issues going on with it...

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Maybe the following will help....
Thought you could use this info about getting FireWire to work!
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KTM450rider wrote:
Do I need to boot from the install DVD?
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↙-----------How do I give Kudos?| How do I mark a post as Solved? ----------------↓

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Great news! The re-image of Mavericks proved to work! I WAS able to mount external drives attached! How is that possible? Don't know, don't care! It just worked! So happy!
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External Hard Drive not recognised after horrible crash and reformat.

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