Sorry saw this but really no time to reply before was sorting the issue on site. This likely just happened due to the cpu load spike that came when it resturned after the power repair was made. Sometimes the IMAP services can respond really slow in those times, and cause your desktop to time out, the service was up as seen by webmail working, but it was not able to answer all, once the load went down after 5-10 min up, it worked right.