receive a "no signal sent" on monitor

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Hello everyone! I used to be on this list but my mail server disallowed it after a few months.?? Beats me.
I do need help and hope this goes through. I have a tower, 1.2Ghz Athlon. I blew it our with an air compressor the other day to clean it. Afterwards, it ran just fine for about half an hour. Then a bod came up so I shut it down. When attempting to boot up...my monitor reads "no signal sent". I have reseated everything in the pc, including the ram. I have tried another video card, all to no avail. The cpu fan is working and a light is on the motherboard. The HD light goes on as well. There isn't any bios beep though. I hope I didn't fry something. Any ideas? Thanks

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Double check all the connectors including the block of connectors from the case to the mobo. Check the cable from the monitor that no pins are damaged, double check that the video card is seated fully as are the other components.
 

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Thanks Zeddy but all is connected ok and reconnected to make sure. Still don't work. I forgot to mention. My monitor works fine connected to my laptop.

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Its not a monitor problem, it sounds like the computer is simply not booting up at all.

If the computer does not boot, then naturally there will be no signal to the monitor. Its certain to be a hardware issue, recheck that everything is correctly seated (RAM, all cards, Heatsink on CPU etc).
 

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Thanks Kiwiguy...haven't tried resetting the cpu yet but that's a good idea. And I should try booting with a cd on my hd. I'll see what happens.

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