re: Lightning damage to computer - how screwed am I?

See if the supply has a reset, I've seen some on the inside of older models.

One of our 6+ year old T7400's had almost the same thing happen with only the LED's appearing to work and nothing else. I pulled the plug from the power supply, hit the reset button and pushed the power button. Everything was working the way it should (blinking LED's on optical drive, fans blowing normally, etc.) and about 3-5 seconds after hitting the start button we had another surge. Never saw the post screen and the fans were constantly increasing in RPM. Knowing that I'll be replacing it soon I let it go for another 15 seconds until it sounded like it was about to turn violent. Waited 5 minutes, reset the power supply again and it started up with no problems.