Blank Screen and Fan on High Speed all the time

We have a TouchSmart PC 300-1000z (Aw021AV#aba) Windows 7 Home 64bit.
This morning the screen was blank and the CPU fan was stuck on high. It will not throttle down at all. We have to press and hold the power button to get the machine to power down.
I can't see anything on the screen so I can trouble shoot it. I did remove the back panels and so forth to dust it with a can of compressed air.
Any thoughts on this?
Thanks.

Hello IDSwagman,
When you boot the computer is the screen completely black or do you see the boot logo screen show up and then the screen go black?
This HP troubleshooting article addresses the issue you are experiencing. The steps you take will depend on if the screen ever shows anything at all or it is always completely blank.
http://goo.gl/LAo04
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The community works together, click Accept as Solution on the post that solves your issue for other members of the community to benefit from the solution.
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Should my Mac mini's fan be running this way?
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4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
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Hi,
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See the suggestions by mende1 here > Mac fan runs all the time

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Blank Screen and Fan on High Speed all the time

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