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1008121
Optiplex 755 only turns on through power supply button, no video output.
So I can't turn on my Optiplex 755 through the regular power button. I have to hold the power supply test button on the back, and then press the on button. The computer then stays on, but I don't get any video output. No BIOS beeps or anything. Not sure what's going on. The service tag is
vande1972
1 Message
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May 8th, 2013 19:00
I have gone thru these steps on optiplex 755 and always the same sounds. 6 buzzes:
1: 3 second buzz followed by same length pause, then
2: 3 second buzz, then immediately,
3. another 3 second buzz, then immediately,
4. another 3 second buzz, then a normal 2-3 second pause
5. another 3 second buzz, and quickly after
6. another 3 second buzz.
That sound familiar?
Any help appreciated!
huztnie
2 Posts
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May 9th, 2013 22:00
ive got the same problem with HeadOnAPike, my system is optiplex 780 i have to follow your instruction until point 8 and i dont hear any beep from the motherboard, the led on the motherboard turn on and i just hear one beep. what should i do?
powerpodge
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87 Posts
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May 10th, 2013 04:00
That power supply sounds like its failed! There are the 4 diagnostic lights on the front of Optiplexes - but they generally dont light when a power supply fails - do they run through sequence - i.e. they flash various combinations as the PC starts? If no lighting up then its not getting to even run the diagnostics which is usually power supply failed - but they are easy and cheap to replace.
If they do light up then whats the sequence they stop on?
The button on the power supply is a quick test button - i.e. when the PC is off press it and it should show a green light. Its only a general indicator though.
huztnie
2 Posts
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May 10th, 2013 05:00
i have try to replacing the new power supply, but nothing happen.. I guess the problem is between the motherboard and the io panel, but im not sure..
Emiljano111
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December 3rd, 2013 23:00
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firs No have any beep or sound /...
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Technical11
1 Message
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December 8th, 2013 23:00
Hi, i have a problem with my system unit " DELL OPTIPLEX 755" No Power...plzz..help..,,
Symtoms Are:
edjo
3 Posts
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September 1st, 2014 12:00
edjo
3 Posts
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September 1st, 2014 12:00
shesagordie
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September 1st, 2014 13:00
544515
1 Message
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January 1st, 2016 19:00
when I tray to tan on my dell optiplex 755 min tower it will not show any thing on the monitor and on leds will light up and when hold the power baton it will not shut down will just restart.
bktylr60
1 Message
1
March 23rd, 2016 20:00
go to the website of discount electronics. they sell refurbished dell parts
nabeel mughal
1 Message
0
August 1st, 2016 23:00
sir my computer dell optiplex 755 tower working good but power buten not work .
cmos out than computer start plz help me .
Roby43
1 Message
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August 2nd, 2016 08:00
I happened to me something like, finally had to use the warranty.