-Check to see if your VGA cable(the cable from your monitor to your PC) is properly connected.
-unplug your PC -remove all devices connect to it(make you remember where each component id connected) -remove the cover -unscrew the Graphic Card -clean the contacts with pencil eraser -reseat the Graphic card(make sure its is properly seated -screw it in place -put the cover back -plug your pc
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if the power light indicator is just blinking with no display, you must checked the power supply the common cause bulging electrolytic capacitor. just replace with the same value and rating then the problem solved.
The monitor should be plug and play, and you've already figured out that it's not your computer by plugging into a working monitor.
This is most likely the power inverter board in the monitor - this is
common in many monitors. If the power light is blinking on-and-off, or just staying on with no image, that's
the problem. There is a slight chance that it could be the light itself, but inverters fail more commonly.
If it's under warranty, send it back, if not, there are
inverter boards for many common models of LCD monitors that are
replaceable. The board can run anywhere from $50 on up. Depending on
how old it is, you may find it better to just replace it with a gently
used one from ebay.
it is probably indicative of a switched mode powersupply trying to start then seeing a short and then trying to start again...this will cycle continuously until fault is rectified..any component that can drain the powersupply is the culprit...you need some way of detaching the powersupply from the load (monitor) to see if the power supply its self is the cause and also check if there is a loop back (a pulse) for continuous running.
First of all it is not advisable to open up monitors without proper tools as they contain hazardous elements. Dell monitors however do have a 3 year SEPARATE warranty. Check on the back of the monitor and look for the monitor serial number. is should start with CN-xxxxx-,, or JP-XXXXX-. give that to a dell tech and they should be able to replace that.