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My computer stopped recognizing internal hardware

I have a Dell Inspiron 1501 running windows vista, and one day when i tried to turn it on the sound icon showed a little red image circle with a white "x" in it. When I mute it, it just shows a red circle with a slash. My computer then told me my sound device wasn't installed. Then i go to get online to try to figure this out, and a caption came up saying the my wireless card wasn't installed. THEN, i go to plug in my itouch and none of my USB ports will work because it won't even charge my ipod. This has never happened before and I'm really frustrated. So I have come to you on my mother's desktop...please someone help.

If all of those internal device your saying is embedded on the motherboard, I guess the motherboard itself is failing, but if those internal device are connected through slots like AGP and PCI, try to clean slots and the devices. For the devices you can used pencil eraser to clean the gold surface on the card. I am not use with the slots.