Question about Dell Optiplex 755 Minitower Desktop Computer
New mother board. The power section of that board probably has some capacitors that look swollen or leaking a brown substance.
Posted on Oct 22, 2013
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Posted on Jan 02, 2017
Make sure the 12v power connector is securely connected to the system board. If you open up your computer look at the end of the board that the memory modules are there is a 4 pin connector thats the 12 v Make sure thats plugged in and secure, If thats ok you have already did the removal of the memory and replaced them, take out any pci express cards and use your onboard video, if that don't work try one memory module at a time see if that works you already seem to be savoy enough to do that and try that, and if that does not work you may need a new power supply. You can check it but probally will be bad I have the same desktop and thats been a problem with these 5150 along with the mother board going out after the warranty expires. I sure Hope this helps you out,, Happy Holidays to you and yours. Hey If you need me to look anything else up let me know. Thanks again bear001
Posted on Dec 15, 2007
ok - the amber light of doom on a dell means one of two things - either your power supply is pooched - or your motherboard, If under warranty dell will send out a friendly tech to replace them - if not it will cost you a bit. get the price and consider if it worth upgrading instead. Contact your dell rep or dell tech support and see what they say
Posted on Nov 30, 2008
SOURCE: motherboard change
check on system lights... what are the diagnostic lights telling you??
if the 4 lights are off you may have a problem with the led itself or the powersupply is just messing with your head.
Posted on Dec 02, 2008
1. Remove All External Devices
2. Check the Computer's Power LED
3. If the power LED has not changed unplug the Power Cable From the Computer Disconnect All Hard Drive Power and Data Cables and power on the computer. If still no go.
4. Remove All PCI, PCI-E, and AGP Expansion Cards .
5. Remove All Memory From the Computer
6. Reseat the ATX and 12-Volt Connections . The ATX connector will be a 4 pin square connector connecting to the motherboard from the power supply and the 12-Volt Connection would be the biggest connector with a lot of colored wires.
7. If still no go.
8. Disconnect the Power Connection to the Chassis Fan
9. If the light still flashes then it could be a power supply or motherboard failure. Try a good know power supply first and if that does not fix the problem it is the motherboard. Also check the back of the tower for 4 lights lables ABCD or 1234.
Rate if useful.
Posted on Aug 11, 2009
Please try the following
1) Remove ALL wires from thw back of the PC
2) Press and hold the power button on for approx 15 seconds
3) Replug only the mains power wire and the monitor cable and then retest
Please advise of outcome
I hope this has been useful
Posted on Mar 05, 2010
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