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Dell optiplex 740 (on/off switch) POST


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#1 stevieg1969

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Posted 18 May 2012 - 07:51 AM

Hello fellow bleepers,
I need to figure out why when I push my power button on, the yellow light that comes on, (normaly for a few seconds during POST) stays on and will not boot. I have to hold the button in until it shuts off then try again. This will happen servral times before the light finally turns green and the machine will boot. Any help would be great.
Thank you in advance for your help. Dell otiplex 740 XP pro.
Steve

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#2 rotor123

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Posted 18 May 2012 - 04:00 PM

hi, From the Dell website

http://support.dell.com/support/edocs/systems/op740/en/UG/trouble.htm

Power Light
Solid yellow

The Dell Diagnostics is running a test, or a device on the system board may be faulty or incorrectly installed.
If the Dell Diagnostics is running, allow the testing to complete.
If the computer does not boot, contact Dell for technical assistance.


Now to the nuts and bolts of it. I have seen Optiplex 740s with bad capacitors.

look here for examples of bad capacitors. the top should be flat and shiny.
http://www.google.com/search?hl=en&pq=dell+yellow+power+lightoptiplex+740&cp=14&gs_id=1l8&xhr=t&q=bad+capacitors&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&biw=1024&bih=619&bs=1&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=wbi2T-vHC4Gf6AG0_5HUCg

A bad capacitor can cause the issue you are seeing. If you do find one or more they can be changed. http://www.badcaps.net has tutorials on it as well as a source of computer grade capacitors. Do not waste your time with general purpose form places like Radio Shack. Or fakes like a lot of the ones on Ebay.

Edited by rotor123, 18 May 2012 - 04:05 PM.

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