Blew out dust on my pc earlier and now it will not boot up. no display but appears to have power to everything else. Any suggestions greatly appreciated.

Check to make sure that all cables are secure. Do you get any beeps when you turn it on ?

Could be a faulty power supply. They sometimes look like they have power, but not enough to power up the PC...they quit with no reason at times.

One other thing you could try is to remove, clean and reseat the ram, it might be full of dust.
Make sure the video cable is secure and wasn't jarred loose.

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I will give it a try thanks. btw there is no beep at all.

No beep means that the motherboard/CPU is not operating. If you used a vacuum cleaner to blow out the dust, you might have zapped something on the motherboard. A can of compressed air should be used for that.

To narrow down the problem, you can disconnect all the drives and cards from the motherboard including the RAM. If you still do not get any beeps, then you have either a bad motherboard or power supply.