我部電腦usb一插即熄機!

Please try to following:
1) plug the mouse to other USB port, to check if they really mulfunction...(and i suppose not)
2) if the mouse doesn't work, then it would "internal" problem" you may need to find a friend to check the motherboard setting for you.
3) if the mouse works fine, but not the cam/ipod, I would suggest that's a problem that those device are actually taking too much power from the computer. and the way to solve this are
i) use AC power aupply for those device while connect to your PC, or
ii) use a USB hub with power supply.

Hope this would help.

你那台電腦，一定是組裝機！？
是朋友組裝的是嗎？
如果是？
我可以告訴你，你前面一組usb插座線，插錯了位置。
所以一插任何硬件入去，就撞機！？！？
現檢查插線是否正確。若不更正，或拆除它？
隨時起（火災）！？不是騙你？