Flashing yellow light, no start

[rdotex]

Dell desktop shut down normally. Now has flashing yellow light behind start button and will not start.

 

[ss202sl]

Unplug the power cord from the back. Push and hold the power button for about 10 seconds. Plug the cord back in and turn it on.

 

[theyeti87]

Have seen this with many Dell Optiplex at work. Yellow flashing light in the power button usually signifies a dead power supply.