USB, Firewire ports not being recognized?

Recently, I've been having trouble using my USB and firewire ports. I have a 1TB WD external hard drive which has been working fine until about a month ago when it stopped being recognized when I connected it through Firewire. I thought maybe my firewire cable or port was bad so I tried hooking it up through the USB port and it still didn't recognize that it was connected. After playing with it for a while, I finally got it to back it up.
Tonight I connected a thumb drive and it is not being recognized either.
Both ports are being recognized it Disk Utility and in System Profiler, and the USB ports work when I use them to charge my phone and Ipod all the time.
Any suggestions?

Well now I feel a little silly..
I have tried using it on another computer and it was recognized just fine.
However, I have not tried manually mounting my WD hard drive and when I went to try to that, it worked just fine right away, without doing anything.
I then tried the thumb drive again and when I tried to mount it, it came up with this error:
"The disk “UDISK” could not be mounted.
Try running First Aid on the disk and then retry mounting."
So I ran First Aid and it came up with this error:
"Disk Utility stopped verifying “UDISK” because the following error was encountered:
Filesystem verify or repair failed."
The details say that the "File system is left marked as dirty."
So I guess there must be something wrong with the thumb drive, although it seemed to work fine on my PC.

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USB, Firewire ports not being recognized?

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