what does a pop sound mean coming from a computer? [HELP!!]

[BBnet3000]

cliffs:

1) build computer
2) turn computer on
3) monitor doesnt get signal
4) 10 seconds later, loud "pop", like those champage popper things. smell of burning, assumed from power supply

so wtf

 

[helpmeout]

My guess: Power supply.

 

[BBnet3000]

MSI "K8T NEO2-FIR" VIA K8T800 Pro Chipset Motherboard for AMD Socket 939 CPU ?RETAIL $120.00

AMD Athlon 64 3000+, 512KB L2 Cache 64-bit Processor ? Retail $175.00

Corsair Value Select (Dual Pack) 184 Pin 1G(512MBx2) DDR PC-3200 ? OEM $160.00

Seagate 120GB 7200RPM SATA Hard Drive, Model ST3120026AS, OEM $91.00

NEC 8X Black Dual Layer DVD+/-RW Drive, Model ND-2510A BLK, OEM BULK $64.00

SAMSUNG 16X DVD Drive Black, Model TS-H352A/WBGH, OEM $24.99

ENERMAX Noisetaker AX Series 420W Power supply, Model "EG425AX-VE SFMA/420W" ?RETAIL $85.00

SAPPHIRE ATI RADEON 9800 PRO Video Card, 128MB DDR, 256-bit, DVI/TV-Out, 8X AGP -BULK -OEM $197.00

 

[amdskip]

Look first for capacitors that appear to have thrown up their guts on the motherboard but in most cases it is the power supply.