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Serial port not found?

I tried to use my arduino today but COM3 couldn't be found. I tried it with older versions and other USB ports but it still didn't work. Anybody knows how to fix it?

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Have you tried a different PC ?
Have you done something bad to the board ? Overvolted a pin ? Overcurrented a pin ?
yonch (author)  steveastrouk4 years ago
When I took the circuit off the board it suddenly worked. I don't know what I did wrong, but the next time it happens I will look for any problem. Thanks anyway...
shorted the reset line.
Does the PC see the USB connection happen ?
yonch (author)  steveastrouk4 years ago
No but the ON led turns on for a few seconds and then off.
Which arduino is it ?
yonch (author)  steveastrouk4 years ago
Uno