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October 18th, 2017 10:00
Dell Optiplex 755 SFF issue
Hello, so i got to school this week and on our computer class we have a Optiplex 755 SFF,
When i turn it on, it just shows 3 4 diagnostic light..
Any help would be apprecciated..
Greetings!
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ejn63
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87.5K Posts
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October 18th, 2017 11:00
This is a memory error.
Unplug the system, hold the power button for 30 sec and remove and reinstall the memory module(s).
If that doesn't clear the error, try one memory module at a time in each socket until you find the bad module -- or, if more than one module fails to work in a single socket - the bad socket -- and replace the corresponding faulty part -- the memory module, or in the case of socket failure, replace the mainboard.
RoHe
10 Elder
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45.2K Posts
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October 18th, 2017 12:00
Are you the school's IT person?
3,4 = Memory modules are detected, but a memory failure has occurred.
downloads.dell.com/.../optiplex-755_user's guide_en-us.pdf
What color is power button and is it steady or blinking? And are there any beeps from the PC?
Power off, unplug and press/hold power button for ~15 sec. Open case and remove motherboard battery. Press/hold power button for ~30 sec. Carefully reseat RAM modules in their slots and use some canned air to blow out all the dust. Reinstall the battery (may be time for a fresh one) and close up. See if it boots now...
EDIT: ejn types faster than I do. :emotion-2: