I just accidentally plugged the wrong power supply into a USB hub which was plugged into my Macbook - everything went pop and there was a burning smell from around the usb ports. It won't switch on now thought the battery still charges. Luckily I backed up last night. Haven't taken out the HD yet to see if that's ok. Does anyone know what the likely damage is and if it is likely to be worth repairing? It's 3 and a half years old. I will try taking it to an Apple repair centre but the nearest one is quite a way away.