I have an ACER desktop that has been a very reliable computer until just recently. Yesterday, as I was shutting it down, the option was "Update and Restart," which I chose. When I tried to us it today, the screen was black and I got the message "No Signal." Nothing I did made a difference, so I did a hard reboot and still nothing. The PC seems to boot up, but there's no display. I've tried this approach 4-5 times and nothing. This exact thing happened with the last Windows Update as well. I've checked all the connections and nothing is loose. I just ran my virus protection and spyware software yesterday and nothing was amiss. This is more than annoying. Any ideas?