My son has a Dell Optiplex SX280. He powered it down last night and this morning could not bring it back up. The monitor still works and powers on but nothing else. We've had a pretty bad ice storm up here with multiple power outages. I am thinking that his AC Adapter is more than likely fried as it doesn't light up when plugged in. Does this sound about correct? Are there any other problems to look for? How can I check the adapter to make sure? Thanks in advance