My Amazon web instance (EC2) is suddenly unresponsive. I can't ssh in, and I can't properly load the website via my web browser; only basic text and broken image links appear. The only change I know of is that I recently updated my public IP for the website. I'm quite new to AWS; any idea why my instance might be unresponsive? Is it possible to check its "health" somewhere? (I can see CloudWatch metrics from the web console, but it is not providing any useful information.)
Update: This appears to be problem others encounter as well, but I haven't found any resolution as of yet.