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I've never seen 2 front USB ports that were bad. I've seen 1 that was defective because the USB device that was plugged into it was broken off. However in that case it caused the power supply to short out and prevent the computer from powering on. Here is a link to your model: ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-760_Service%20Manual_en-us.pdf If the USB ports on the back of your computer work then the front ones should too unless there is a connector dislodged to motherboard. All USB ports use the same circuit.
It sound like your USB Ports is the problem. Go to the Hardware manager delete the USB Ports and then shutdown and power back up.
The system then should reinstall the USB Ports and associated drivers. If not the USB Ports were probably fried by the power outage.
If your system is USB 1 rather than USB 2 then some flash drives will not work. Not all usb 2 flashdrives are backwards compatible. My kids flasdrives will only work on my usb2 ports & will not work at all on my wife's computer which has the older usb 1 ports.
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