Problem interfacing ArduinoMega-2560 with laptop

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im using arduino mega 2560 , working fine. tried energize relay coil of 5v using digital output pin of arduino , ground pin, worked , after minute disconnected arduino. later when tried upload new matlab model, laptop not recognise board..i not see in device manager.

but power on led , led near 13th pin working when connect board using usb , last program burnt on board still there , running fine.

what problem? operating system windows7.

unless relay small , has snubbing diode may have fried pin.  pin did use?  if 0 or 1 may have damaged 1 of 2 pins used serial i/o.


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