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Not sure about dell mobos.. Asus usually has some led indicating there is current running on the board even if it's off..
From my experience i can say if there is no beep that means the memory is defective, preventing the system to do P.O.S.T. (power on self test) which is where the beep comes from.
Being a Dell system i'd say you should go for it's help desk.
If that's not a option you can remove the memory and see if there is a beep, if not, the other part that can prevent the system to POST is the processor.. If you have another (working) system you should test both memory and processor there.
the problem is in your motherboard..this most cause unregulated flow of power from the source electric..but if the green led is off so its the processor.try to test it with a motherboard tester..or get another board that same spec with the you have,and transfer the processsor if it is working
it could be a mother board problem or Power supply issue. Even if the power supply works it wont supply required voltage to some components.Its better you get a new power supply and test it.Still its not working it could be a mother board issue.There will be a chance for power button issue also.
it happens when one of the component would not give the exact dc supply to its component near to each other and its so hard to replace a chips that has been broke down. okay, try this, although its to risky but theirs no other way to test your main board if its still good. if your video card is built in, plug the external video card. if your main board accept AGP or PCI then try them one step at a time. load the memory then try booting it again. if it still has no display bring it to a service center near you ask their assistance to make a series of test to your main board. Im sure they a device to test all the IC's and the chipsets. Good Luck!