Check the fan, maybe the fan is stuck, dirty or just at the end of it life cycle
If the machine boots up and you see the operating system start.
Then the loud humming could be fan dying as william stated.
If the fan speed max's out and the fan blades do not turn. It will sometimes hum very loud. The screen blanking out could be the system reaching heat levels too high. PC's often have more than one fan. Open the case and check for dust clogging the system.
Blow this out with compressed air. Vents, fans, fan blades etc.
Then see if the system runs within normal temps.
Note: hold the fan blades while using compressed air. You do not want these to spin at crazy speeds which will happen with the compressed air. Replacing any of the internal fans is simple.
Usually 4 screws and a power plug.
If the fans turn and do not pause or hang. I would then suspect the power supply. If your comfortable working inside the computer.
Switch out the power supply and hopefully this will resolve the loud humming. I have actually watched as a power supply died.
Humming noise then a little wisp of smoke. Dead as a door nail. :)
Good luck and hope this helps.
SOURCE: The pc not starting up
TRY F8 WITH NETWORK SEE IF IT STILL SHUTS DOWN IN 10
OPEN THE SIDE TO LOOK INTO THE SYSTEM TO SE IF THE CPU FAN IS SPINNING AND SEE HOW CLEAN OR DIRTY IT IS. IF IT'S SPINNING SHUT IT DOWN AND DIRTY YOU'LL HAVE TO CLEAN IT UP,THEY HAVE AIR IN A CAN
USE THAT TO BLOW OUT THE JUNK IN THE SLOTS AND SEE WHAT HAPPENS WHEN YOU FIRE IT UP THIS TIME
SOURCE: when i turn on my
stop Turning on.
the reason may be either of them:
1. Hardware faulty.
2. Loose cables/cards
3. Bad CMOS clock.
we deal with all of them.
1. Change CMOS Battery and short free the RAM by jumper(Uou need to check the manual or let me know the model.
2.reseat all the cables and Cards.
Boot the system Now.
Still give a long Beep?
(It may be a Hardware gone bad) But we need the confirmation for HW itself. We may conduct tests.
Dell Systems are reliable and least troublesome.
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SOURCE: Dell Dimension 4700 desktop. Turn computer on, go...
try to disconnect, stretch the master cable of Hard drive and then connect it.
could your graphics card be bad?
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