Dell Optiplex Lights on before Switching on

I borrowed an oldish Dell Optiplex (p4 3.0 Ghz ) from a friend of mine (to play games that are not supported in Win7 :D ) .
I connected the PC to a UPS, and also fixed a DVD ROM in addition to the existing stock CD Writer.
What i notice is when I switch on the UPS( only the UPS. i do not power on the PC) , the power light(green) comes on in the PC for an instant, along with the green LED on the DVD ROM (Note: They are switched on only for a split second) . After that i switch on the PC normally and everything goes fine. Is this a problem? I have very little experience on Desktops as i have been using notebooks for most of my life. So i do not know whether this is an issue - I assume it might be some issue with the PSU. So expecting some advice from you guys.
4 answers Last reply Best Answer
More about dell optiplex lights switching
  1. Best answer
    Normal behavior for an Optiplex.
  2. This is normal, do not worry about that "Feature" dell optiplex have!
  3. Best answer selected by dsit86.
  4. thanks for the reply folks. If it is normal i guess nothing to worry then...
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