Is this a bootloader error?

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hello.today morning while getting hang of pid setup arduino stopped sending serial info on pc.this had happened before reconnection , reset fix it.this time though orange led wouldnt blink when pressed reset...the green light on means has power.also when connect pc hear "sound" of connected usb device stays , if try flash arduino console stays on flashing message.
is bootloader problem?
if can fix it?

win7 64
arduino mega
ask further info if needed.

do have arduino or icsp programmer ?

if do, can reflash bootloader, if suspect misbehaving.


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