Unable to upload to any arduino

Decided to start a new project today. I have several Unos and Megas, none of which will upload and give the following errors:

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x30
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x0f
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x10
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x20
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x0f
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x10
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x30
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x0f
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x10
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x20

I have done the loopback test on the arduinos, (both passed) and have confirmed the proper COM port. I'm thinking this is a problem w/software somewhere on my computer as opposed to actually a problem w/the arduinos themselves. Just not sure where to start w/diagnosing this problem. Thanks for any input if you guys think of anything.

Have the boards worked in the past?
If you push the reset button, does the LED flash quickly a few times?

Yes. To clarify, i tried them on my laptop and it seems that the unos are the problem as they are getting the same bug. The mega is working though. So it may be the unos themselves. Yes they have worked in the past and still have their old sketches on them too.

[quote="crowmedic, post:3, topic:1305967"]
So it may be the unos themselves.
[/quote

If you push the reset button, does the LED flash quickly a few times?

Yes it does flash multiple times

That would indicate that the bootloader is still there and active.
So I'm puzzled. If the loopback works and the bootloader is apparently still there it should work but as you say it does not.

So I spend the last few days at work and was unable to test it. However I just plugged one of them in and was able to upload a simple sketch that is working as expected. Strange behavior and I have no idea how to replicate it, as I had already tried restarting my computer when I originally had the issue. Well I guess I'll close this for now, but thank you jim-p for the input!

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