when I put my pc into power saving mode. i cant wake it up like it should. i get no picture while the pc makes all the noises it should, fans etc... basically, the pc freezes when trying to wake it. I have set so that the powerswitch will put the pc into power saving mode, but when pressing the powerswitch (under the crash) again, the pc doesnt respond, it should reenter powersaving mode but wont. ie, the computer freezes when i want to wake it up. im forced to hold the power button for a few seconds to turn off the computer. but when starting it after the crash, the pc beeps and i wont get picture again! I have to then unplug the power cord from computer and start again as normal.

the powerswitch glows orange when beeping. according to the manual, there may be a problem with the motherboard or power supply if the button glows orange. if there is a problem with the motherboard or the power supply, why are the pc working normal right now? 

ive done a diagnostic test (f12 boot) with no errors.

i have all the latest drivers.

windows 7 64
dell studio xps 435mt

HELP ME PLZZZZ