Arduino not being detected by PC.

Development Tools IDE 1.x
1

Hello & Happy New Year!

A few days ago my Arduino Mega 2560 rev 3 was connected to my computer which unexpectedly restarted.
Since then it is not detected by any of my computers. I tried with Duemilanove which I also have and it worked with same cable & pc. I read that it might be something with 16u2 uc. So I tried to reprogram it with avrdude and my Duemilanove as programmer. Command prompt showed writing, reading then verifying. So everything should be OK (?). But when I connected my Mega it still didn't work.
Is there any way to fix it or I have to buy new one?

Regards,
MatixYo

PS Sorry for my poor english skill.

2

From what you explain it appears that the USB drive on the board is not responding for some reason. I would try installing the FTDI drivers just in case although I fear it will not help. That's a bummer because it appears that other than that it is a working board.
The restarting of the PC may have produced a spike in the input voltage to the board.
Sorry to hear.
good luck

3

Which one?
D2XX or VCP?
I used this code to flash:

D:\Programy\arduino-1.0.5\hardware\tools\avr\bin>avrdude -C ../etc/avrdude.conf
-p m16u2 -F -P COM3 -b 19200 -c arduino -U flash:w:../../../arduino/firmwares/at
megaxxu2/Arduino-COMBINED-dfu-usbserial-atmega16u2-Mega2560-Rev3.hex -U lfuse:w:
0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xF4:m -U lock:w:0x0F:m -v

I toke it from Arduino readme file but it was for 8u2 so I modified it. Maybe something is wrong with my code?
If I can communicate with 16u2 throught icsp then maybe there's chance to make it work?