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Check/reseat monitor cables. If the fan and HDD are running, perhaps the power led is out. Check the monitor cable connections. Is the monitor plug into AC? Turned on? Shut down Desktop , unplug, reseat Graphics Card, if applicable, reboot.
Monitor is not getting signal - picture from pc. Did this ever work or is this new pc? Is PC running? Does it do more than just blow fans? Like hard drive spinning up etc.. Check your video cable connections. Turn off monitor and pc first. Remove and re plug both ends of the video cable. Look for bent pins in plug ends before re pluging. Try a different cable if possible. If not fixed, you may need a new video card. Is this a pc that was working and suddenly failed? Either the pc is not running, or the video card is failed.
With a loud squeal, it is either your hard drive eating itself up or a fan trying to spin. If it sounds like a pretty songbird caught in a blender, it's probably your hard drive. If it sounds like your younger brother trying to make the most annoying sound in the world, it's probably your fan. To check you could blow compressed air into the fan ports to see if it dislodges a lot of dust. I'm guessing that it's your hard drive though because it is accompanied by the clicking which may be your hard drive trying to reset itself, but having a physical problem. Don't worry, after a few minutes it usually fails completely and you won't have to listen to that noise any more. Maybe take the hard drive out and put it in an external case and see if another computer can read it. Or go on Craigslist and find someone to fix it for you for $40.
Check your monitor,if it is running fine.Switch off your pc and monitor both.Switch on again.If u are not getting any display on screen ,u may need to repair your monitor.in between press on capslock or numsluck key.If keys are giving lights then 100% it is a monitor problem.
check both your power and video connections to the monitor, sounds more like a monitor power issue.
if the connections appear ok, but screen still blank, try connecting a known good working monitor from somewhere else and see if it works with your pc, if it does, your original monitor is faulty, if it doesn't, you have a pc video issue.