visually or is there a program that can check them?
ill take a look and see maybe it is. my kid broke one of the usb ports a wile ago it might have shorted out
lol I don't even see the regular capacitors they are all silver cap tiny ones. but they all good no burns anywhere.
I donno what else can cause this inside windows system?
If none of the USB ports look physically damaged/burned, some other things to check:
Is it only happening within Windows? Have you tried running a Linux LiveCD?