Could it be your video card? Whenever I have to troubleshoot something like this I start with removing everything but bare essentials, if I still get nothing, I move to swapping parts one by one, but not everyone has bits and pieces lying around. Have you checked your mobo manual for any jumpers that have to be set, CPU speed, vcore? Is the RAM installed in the first DIMM? When you run with bare essentials do you completely disconnect the extra components? Could you also provide more details on the make and model of the CPU, mobo, RAM and VGA card. I know I am asking a lot, but without being there myself, it is very hard to assist you.

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With no ram it won't work, no beeps no nothing. it's probably not your hard drive or cpu since you tried new ones and still nothing so the only thing it could be by the sounds of it is the ram, what brand is it? or your video card like adam said did you try your video card on another system?

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I have seen systems with stuffed hard drives do exactly what Zac's is doing, but that aside, I am starting to think that this is more than likely caused by either the VGA card or the PSU. Try removing the VGA card altogether, if it is the vga card causing this, you should hear a sequence of five beeps indicating that there is no VGA card installed. If you still get nothing, I would look at the PSU.

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The video is on-board. Samsung pc133 128 ram. And I also tried Kensington. Can RAM go bad easily ? The samsung was brand new. I'll pick up some more ram tomorrow. And try it out. Otherwise... I'll drop it off the roof of my house, that might do the trick :)

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Oh well, then my money is on your power supply, you have eliminated everything else. Still let me know what the make and model of the mobo and cpu is.

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MB - Intel D815EEA2 815E-CHIPSET CPU - Intel P3

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What speed P3? Is the RAM double sided or single sided?

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One other possibility is that the mobo doesn't support FC-PGA2 cpu's. Does the CPU have a big silver heat spreader on it?

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make sure ram is in the first dimm slot so the onboard graphics can function

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Adam seems to be wright, you need an Intel 815 B-Step chipset for PIII/Celeron FC-PGA2 (Tualatin) processors. Seems that you have one of those processors and your MB simply cannot handle it. The Tualatin requires a new chipset because of its use of a lower voltage clocking specification. Pentium II/III processors use Assisted Gunning Transceiver Logic+ (AGTL+) technology for their FSB, the bus uses 1.5V signaling; however, the Tualatin uses a lower voltage bus that runs at 1.25V. More specifically, the Tualatin uses AGTL signaling that unfortunately requires a new chipset with support for 1.25V AGTL signaling instead of 1.5V AGTL+ signaling. The fact that there aren't beeps without RAM is a good clue... Besides that it is manufactured on a 0.13u process, the Tualatin requires much less power than the Coppermine core. The VRM 8.4 specification that was used by the Coppermine only provided support for voltages in 0.05V increments using four VID pins (VID0 – VID3). In order to provide support for smaller voltage steppings, the Tualatin requires a new VRM specification, VRM 8.5 that adds two additional pins: VID25mv and VTT_PWRGD. The VID25mv pin works in conjunction with the four original VID pins in order to allow for 0.025V voltage increments. The VTT_PWRGD pin requires a 1.25V input; if either of these two pins isn’t properly connected then the system will not boot. You see, probably you are trying to use a Tualatin processor with a non-Tualatin board.

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