First, unplug everything non-essential: the DVD, FDD, HD, no AGP or PCI cards, mouse. Then try to boot. Still no, try another keyboard. Still no, clear the cmos. Still no, check ALL the jumpers per the manual (
http://www.shuttle.com/new/support/d...p?model=SB61G2).
Also check all connections: ATX, DIMM. Make sure the voltage switch is correct on the PSU in the rear (should be 115, not 220). If you can, try another stick of DDR.
You don't have to do them in that order, either. You may want to start with the jumpers. All this and still no? Let me know, we'll try some other tricks...