Mac mini not recognizing USB mouse and keyboard upon boot

hey guys, i have a 2.4GHz mid-2010 mac mini with 2GB of ram, running 10.6.8 with all software up to date. this computer was purchased about two months ago. when i boot the computer, it does not recognize the USB keyboard or mouse though each is powered by the USB ports. oddly enough, after waiting for about 5-10 minutes, the keyboard and mouse magically begin to work normally and anything i did while they were both "frozen" happens all at once.
any ideas? i've done an SMC reset to no avail, tried other USB keyboards/mice, and i am unable to reset the PRAM because the keyboard doesn't work while the computer is booting. thanks in advance.

yeah, i did all of that; former tech here. i might just nuke it and start over, i wanted to post and see if anyone had the same issue. bizarre thing is that it actually DOES recognise the peripherals and they start to work after about 5-10 minutes, 'remembering' everything i did while it was semi-frozen. i.e. the mouse starts clicking everything i clicked, the keyboard logs all keys pressed, and everything happens all at once as it 'wakes up'. haha. one of my co-workers told me that the girl before me who was using this mini wasn't too bright and had that whole macdefender thing happen so it might be some residual leftover from that.
it also takes a pretty long time to boot so i'm suspecting it may or may not be something hardware-related.
thanks for your response!

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