Question about Dell Optiplex 755 Desktop Desktop Computer
When i power the pc has steady green light but a very loud fan noise and nothing shows on the screen
Is the computer completing post? This is indicated normally by a single beep after the power button is turned on. On most computers the beep is proceeded by a post screen with the manufactures logo. If the computer is not getting this far, unplug everything but the memory and video. This should cause the computer to give a no hard drive or OS error. If not pull all the memory, this should cause the computer to give a series of beeps (because there is no memory installed). If this does not work either, you could have a bad mother board or power supply.
Hope this helps
Posted on Jan 26, 2012
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Posted on Jan 02, 2017
If under warranty contact Dell? I had this same problem, a new motherboard and fan assembly fixed this problem. Bad capacitors on the motherbard.
Posted on Apr 12, 2008
Disconnect the Power cable / A/c adapter/Battery from computer.
Disconnect External peripherials.
Hold down the power button on the computer for 10 seconds.
Reconnect the power cable or A/c adapter and battery or the computer
Try to turn on the computer
check for Led's on the computer
If still no display ,shut down the computer,disconnect power cable.
Open the computer tower,remove memory modules,reconnect power cable and turn on the computer.If you get a beeping sound after turning on you should be getting beeping sound suggesting the mother board is not bad.Turn on the computer and disconnect power cable from computer.
Reseat 1 memory at a time if you have 2 memory module or if single memory module reseat in different memory slot,swap memory module.
Reconnect the power cable and turn on the computer if it boots to desktop possible issue with 1 of the memory module.
Disconnect the harddrive ide cable from the harddrive .Turn on the computer.
If still unable to power on .Shutdown the computer and disconnect power cable.Remove video card,sound card ,modem card if any .Connect just the vga cable from monitor to the integrated video port.
Connect power cable and turn on the computer.
If computer turns on possible issue with one of PCI or PCI express card.
If still unable to power on.Disconnect the power connector pin from the motherboard and reconnect it back.Turn on the computer check power power led on motherboard,also check if the processor fan is spinning. if no go then issue with motherboard.
Posted on Sep 03, 2009
Testimonial: "Very detailed advice, thanks! I believe my motherboard is bad, after testing with your suggestions. "
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