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1992
Replaced an Optiplex 755 Power Supply and now have no video feed
We replace the existing power supply (model no. L305P-01) with a new power supply (model no. N305P-06) and the computer will come on put we are not getting a signal to the monitor. Are the two power supplies similar? Really not sure where to go next and any help/direction would be appreciated.
speedstep
8 Wizard
8 Wizard
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47K Posts
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December 2nd, 2016 08:00
These units should both work on a 755 Mini Tower. The DL2032 battery may need replacement.
Take out all ram and it should beep low and slow.
beeep beeeep beeeep beeep
Then add 1 ram stick.
Sort thru each chip one at a time which should be matching pairs of ram.
DELL-Chris M
Community Manager
Community Manager
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December 2nd, 2016 09:00
L305P-01 = NH493 305w Liteon PSU
N305P-06 = C248C 305w Delta PSU
They are both on the Optiplex 755 parts page. Does the PSU fan and fans in the Optiplex 755 spin up on boot?
LECLLC
4 Posts
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December 2nd, 2016 09:00
I re-reseated the memory and now the monitor is working. However, the back USB ports will not work for the mouse and the keyboard. I plugged the mouse and keyboard into the front USB ports and they are working. Any clue as to why the back USB ports would not be working?
DELL-Chris M
Community Manager
Community Manager
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December 2nd, 2016 09:00
Check the bios and see if there is an option to Enable them.
LECLLC
4 Posts
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December 2nd, 2016 13:00
I would need to do that at bootup correct?
LECLLC
4 Posts
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December 2nd, 2016 13:00
yes both fans are spinning and the computer seems to be working other than the back USB ports which were working before the PSU upgrade. For some reason reseating the memory seems to have brought the computer back online.
DELL-Chris M
Community Manager
Community Manager
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December 4th, 2016 13:00
Correct, press F2 on restart.