HELP: Computer Deaded

I use my computer all the time as do most avid computer users, so its never off ever! i awoke tuesday morning to the sound of my alarm on the computer, as always i reach over n put snooze on, as i was falling asleep i heard a crack n i was thinking at the time could have been the sound system on it. neway i didnt go home tuesday night i stayed at a mates house. went home last night n found that the computer was switched on still but nothing.

I hard rebooted the computer and it powered up, hard disks span, light on usb keyboard n usb mouse light, ethernet cable had some power to it, jut ntohing was coming from my monitors.

so last night, i unplugged everything inside and tried booting it bare n nothing,

i removed GFX cards switched it to normal mode instead of sli (got 1 of them sticks in where ya have to do it manualy.)

now tried again but tried it with both cards but 1 at a time in both sli slots n still nothing.

replaced the motherboard and tried again with both cards in both slots at seperated times n still nothing

ne ideas?

specs of comp please? have you taken all parts out of the case and booted it on a bench (have just cpu/mobo/ram/gfx connected to monitor)

yer i have done

AMD Athlon 3000+ 64
512MB Ram
no idea of board its Nvidia n-force 4 sli
the otherboard i tried ASUS A8N32-SLI Deluxe NVIDIA nForce4 SLI X16
gfx cards r nvidia 7300 256mb

probably your gfx card? and does your monitor have power? try booting from onboard gfx if you have them

on a side note ram bottle necking that system

no onboard graphics, monitor does have power cant be monitors as theres 2, n can both card go?

can you hear hard drives loading windows, there's distinct noise difference between hard drive spinning up on boot and windows loading.
If you have tested a diff mobo that rules out that (unless you have 2 faulty boards), sounds to me that it could either be borked gfx cards (which are unlikely but possible). So my advice is find a friend with a skt 939 setup and do a parts swapping session cpu-ram-gfx in their comp till you find the culprite.

update:

think this might have caused it?

i know there not clear but the gray capacitor looking thingies (says he with an qualification in electronic components) but theres brown paper looking things coming out the tops...

That's not meant to happen..

it looks fryed to me.

imo think u might need to invest on some new ones. i dono if its beyond repair

wtf??? 1st for me too, fire hazzard tbh and u left that on all the time