My iMac suddenly does not see any external hard drives

1 x external HD (USB2), 3 x USB2 flash drives - all previously used without any problems.
I have checked DiskUtility, and they do not appear.
I have checked Finder/Preferences/General and the external HD box is checked.
I have run every diagnostic available with MacKeeper and there are no issues detected (all duplicate files, wasted space files, cache files, etc have been "repaired". Still nada.

Thanks baltwo,
This solved it for me...well, mostly. Two of the flash drives are working, as well as the ext HD (though the cable I was using also needed replacing, but it works fine, thankfully). The third flash drive still not working, but I think it's the drive itself - had to use it at work a few months back on a PC and I'm pretty sure it got corrupted. Ah well!
Cheers

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