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There are several possible problems. 1st thing to check, carefully disassemble the motherboard components and lay them all out on a table while FREQUENTLY discharging static on a grounded case oy using a static wrist strap - it is important. Caregully remove the heatsink and then the CPU. THe current heatsink/fan designs are awful n most cases. A LOT of boards are screwed up because people push down too far when installing the heatsink and board gets scraped. If your board is scraped, the CPU won't run and the manufacturer might not replace it. Inspect with a magnifying glass if you have one. Also - NEVER run a current generation CPU without an operating heatsink. I fried a 1.2Ghz in 15 seconds without the heatsink installed... Doesn't take long...
If your board checks out OK, use a box or flat, non-conductive piece of something to place between your motherboard and your case, hook up the pwr/spkr/pwled/reset wires to the proper place on the motherboard (sometimes you'll also need to flip 'em over). Hook up the Main power to the board, put only the AGP card in and with the CPU/Mem/Heatsink installed, see if it will start up. No drives/NIC cards or anything other than CPU/MEM/VIDEO/ should be installed. If it works then, you may have a problem with the way your motherboard is grounding to the case. You'll need shims, those little wafers on the screws, to keep the board from physically touching the case.
Another possible problem is the power supply. AMD is very tough about them and a 250 probably won't work and a 300 with some fluctuation may not work - I run an Enermax 400 powersupply because it's the best out there for relatively short money. The 1.0-1.4 Chips consume a lot of power, the XP and later chips require much less power so the PS is not as much of a factor...
Try all of these things and let me know how it worked (or didn't work)...
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