computer won't boot up (abit ni8)

sinjin

Distinguished
Jan 22, 2005
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18,510
i have a newly assemble computer that i put together. it powers up then i hear 1 long beep followed by 3 short beeps then the computer shuts down. also the POST code 87 (NET PC: Build SYSID Structure) keeps appearing. does anyone know how to resolve this issue? please help. thanks.

here are my specs:
Pentium D 3.0 Ghz
MOBO: Abit NI8 SLI
1 gig Cosair DDR2 667
GeForce 7600 GS