SOURCE: Optiplex 560 Power Intermittent
Try updating the BIOS. Seems there were some advanced power management improvements.
Dell Downloads
The following changes were made to the A04 BIOS for the A06 BIOS: 1) APM issues device commands in SMM. 2) Fixed APM to issue power up/down commands to peripherals in SMM. 3) Turbo/Deturbo switching done in SMM. 4) Implemented <\> Turbo/Deturbo hot key. 5) Password checked after exiting Setup and before OS booting. 6) Fixed the problem with #9 GXE64 Video card losing its video at the end of POST. 7) Fixed the problem with WINICU having General Protection Failures. 8) Fixed the problem with Real Time Clock not being updated correctly when in Power Managed mode.
SOURCE: Dell optiplex won't Boot-up.. Orange light on motherboard
its going to rather your power supply or your motherboard has died, id try a different power supply first
SOURCE: Updrading power supply of Dell Optiplex GX280 Small Desktop.
I doubt your fans will cope ... especially if you have the small form factor (SFF) case ..
So think about fitting additional / higher speed fans (to blow hot air out of the case) before adding extra power hungry cards ..
SOURCE: Problem power supply dell optiplex 740 blinking
hi,
this is probably a no power/nopost problem here is a helpfull link
http://tinyurl.com/d4t55m
further queries are welcome
if you think my solution was helpfull please do rate me
SOURCE: Dell Optiplex GX280 Video Card Install Problem
You hit that one right on the dot. ATI website showed the specs for that graphics card you installed as needing a 300 Watt power supply. Good news though... I researched newegg.com and I believe I found your 300W power supply. There are 4 different Optiplex gx280 designs with 4 completely different power supplies. Since you bought the low-profile video card, I believe you have the slim computer case and this power supply should work for you...
http://www.newegg.com/Product/Product.aspx?Item=N82E16817374002
Good Luck
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