Channel starting to feedback as soon as its record enabled

[dxl201]

I am using mbox2 and now I am having this feedback as soon as I click record enable on the channel and it is totally unworkable. I have my setting as Input: IN1 Output: OUT1-2. I went back to setup-I/O to make everything back to default but it still does not work. I am sure the problem is not caused by my microphone because the feedback is still on even when the Mic is not connected to mbox 2 so I am sure this is some PT internal problem. I am not sure if 7.42 is causing this problem but I did not have this problem before I updated my Pro Tool. Thanks for taking the time to read this post, any help will be appreciated. Thanks again.

[OddsAre]

need more info, what OS version? What model computer? can you start a whole new session choosing default I/O right from the beginning? not "Last Used" can you try input 2? does it do the same? Did you try restarting the computer for the heck of it?

[dxl201]

wow, thank you so much. I was too frustrated and I forgot the easiest solution in the world- RESTARTING. Problem solved, thank you so so much!!!!!