[cruise350]

Try a different cable, or delete and reinstall the drivers on your computer. Delete HTC sync from your computer if installed. Then try it all again. Make sure you reboot your computer also, alot of people just hibernate their computers and it may need a reboot to recognize the new evo. If none of that works and this is the first time you've tried to connect this replacement evo to your computer it may be a bad micro usb port. Try plugging it into another computer and see if the computer recognizes it.