please am having a problem

Hi guys my pc was working perfectly i decided to protect it from dust by cleaning it...after finish cleaning it ..i on it the system was on the power button light was on .and the fans are all working the hardisk i can hear it spinning, but the display doesn't come..all i see is that ....monitor going to sleep ...pls what is the problemm
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  1. Could you have dusted the Function key that controls screen brightness and turned it right down?
  2. Sometimes it's the silliest of mistakes, but did you connect the display to the graphics card or the motherboard?

    What are your full system specs, anyway?

    -Wolf sends
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