MBP can't recognise external devices??

We have a Mac Book Pro and it has been working fine till this morning when we attached the external hard drive and the icon didn't show up on the desk top like it usually does, I did a search for it and couldn't find anything. I attached the external hard drive to my Mac Book and it showed up no problems with all the files etc. I restarted the MBP and reattached the EHD and the computer won't recognise it. Also the firefox icon in the dock was blanked out and the program has disappeared all together! I restarted the computer and now everything seems to be scrambled with nothing in it's normal place, I can't open normal things like the trash, but can open things like text documents. Disk Utility won't do anything, it just opens and says it is searching, I left it for 15 minutes and it was still searching. If I go into find the same thing happens, it just searches and won't bring anything up. I connected another external hard drive and it won't show up and I also connected my ipod and it won't show up, however I can access it through itunes. I put a blank CD in so I could burn some files to it so I won't loose my stuff if there is something major wrong, but the computer doesn't even recognise that there is a CD in there.
I have switched the computer off now, because it seemed a little hot - no more than usual but I don't think I have heard the fan run at all today and I don't want to make the problem worse by running a hot machine.
Does anyone know what could be wrong and how I could fix it? There are a few really important files on there that I can't risk loosing, so want to back them up (that's what I was trying to do this morning!) before I do anything major, but don't know how to do this when the external hard drive, USB or CD can't be recognised????? What's the possibility of attaching the MBP to my MB and transferring that way? I don't want to risk corrupting the other computer...
Any help or advice would be appreciated!!
Thanks,
Kat

Hi akgalle
Greetings and welcome to the Apple Discussion boards
Try resetting the PRAM: Resetting your Mac's PRAM and NVRAM
Luck-
-DaddyPaycheck

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