Won't post at boot up. post light flashes, no video

Hello there: here is a list of things to try
first make sure that you monitor is working try it on a nother computer if you have axcess to one
when the computer boots up is there any beeps please let me know

you may also want to turn off the computer and open the case and remove the powersupply harness that goes to the motherboard then press the power button for 1 minute to release any esd that may have built up then reinstall the harness to the motherboard.

ensure that all of the cables are securly connected unplugging and reinstalling them can help. also since the case is open this will be a good time to clean out all of the dust and critters that may be hiding in there

if you have a removable video card and if you can get a nother card to test with please try it
if not remove the card restart the machine after you hear the beeps turn off the computer reinstall the card and than reboot the machine ok please try each of these and keep me informed how this goes
best regards mike