When you used the vacuum hose, did you have it blowing the dust or sucking the dust into the hose?
Whichever method you use, you have to be REALLY CAREFUL, especially when using pulling the dust through the hose.
"Some sources recommend using a regular or specialty electronics vacuum cleaner. These appliances could cause magnetic damage or static electricity, or dislodge or inhale poorly secured chips or components.
Taken from http://www.ehow.com/how_3664_clean-computers-insides.html
It is good to clean out the innards of your system, but there is a right way and a wrong way.
Others may be able to help you troubleshoot the issue better than I can.
I didn't see your post that you had figured it out. What was the problem, so others can benefit from the solution.
Edited by Queen-Evie, 22 August 2008 - 12:03 AM.