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51387
No monitor, Keyboard, and Mouse Signal
I have tow Dell desktops with this problem. Identical problem on both computers.
No signal to Monitor, Keyboard or Mouse. All three work just fine with another desktop.
I already tried the "Unplug everything. Hold power button for 30 seconds" trick. No change. Still the same problem on both PC's.
Please Help.
mp10384
4 Posts
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September 24th, 2014 20:00
So I just reseated the memory. I did it earlier but I did it again just now after looking at the diagnostic codes in the manual you sent me. First computer seems to be working. I got video on monitor and keyboard and mouse both are working.
Thank You for all you help.
mp10384
4 Posts
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September 24th, 2014 18:00
OptiPlex 755. Windows 7. Both computers.
RoHe
10 Elder
10 Elder
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43.5K Posts
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September 24th, 2014 18:00
Always include PC model and version of Windows in your posts.
RoHe
10 Elder
10 Elder
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43.5K Posts
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September 24th, 2014 18:00
Desktop, Mini-tower, Small Form or Ultra Small?
Seems odd that 2 PCs would have same problem at same time... Did you have a power failure or surge?
What color is the power button and is it steady or blinking?
Any beeps from the system?
What color are the 4 diagnostic LEDs on front panel?
You can look up power button LED codes, beep codes and diagnostic LED codes in the manual.
mp10384
4 Posts
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September 24th, 2014 20:00
Desktop. Mid Towers.
No power surge.
One was at my business. The other was at home and not even plugged in. When I noticed the problem at work, I brought the whole setup home. First I tested the monitor with a my daughter's desktop. Monitor works fine. Then, I hooked up the second Dell that was sitting on the side. It's doing he same thing.
Power button is Solid Green. No Blinking.
No beeps when I turn it on.
There are four letters (with symbols next to them) on the front panel.
#1 and #2 are off. #3 and #4 are lit Green.
I did a clean install of Windows 7 a few weeks ago. But they both ran fine after that. I was even using the one at work regularly.
Both PC's are identical. Both have Video cards with DVI output. I even pulled out the video card in one and plugged in the VGA cable. No dice.
skylarking
548 Posts
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September 25th, 2014 03:00
RoHe gave you the likely answer via a hyperlink to the Users Guide, though i suspect the needed info will actually be in the Service Manual.
As i only have the Service Manual for an Optiplex 780, which on page 14 contains a description of the Diagnostic lights for that system, i can share those pages with you that state the following:
So it's likely you have a DIMM failure, so look at the suggested resolution above...