I got a thermal shut down message on my work computer. I work in a dusty shop so dust does accrue rapidly. A coworker and I carefully opened up the computer and blew it out with canned air. After putting it back together, the thing would not boot up. Upon hitting the power button, I can hear the disk start up, then nothing. The power indicator light is on, but nothing happens. Our IT guys didn't sound hopeful. Any ideas on what might have happened?