Computer is totaly dead

[undead_spectre]

I have a P4 ona giga byte main 8knxp with 2 serial HD 1 ide hd and 3 cd rooms 5 internal fans and some light that came wiht the case
the p.s was 350w it was working well until i conected a usb find it odd that comp didnt do his plug and play recognition so i unplug it again .and boom comp died ps had that nice burnt smell well went out buy a antec 430w conected the right plugs and nothing comp is still dead. I already unpluged all the cd rooms HD and fans just left the main cpu ram and still nothing

I wonld hate to think that i shorted out the main board some how
so i would like some advise before i throw it out the window

tho if its any help after i conect the P.S it makes a small sound
tho the PS works in my old p4 S 438

[sshaw223]

What I would do is unhook everything just as you did. Make sure that you have the fan for the heat sink attached to the Mother Board. Reset the BIOS on the MB. See if it will boot.

[johnnyis42]

good start.

next if you get nothing, pull out your ram and leave the cpu in place, with allt he drives unplugged and no pci or agp cards plugged in see if you can power on your system. if there is a power LED on the motherboard and it lights, and the pc speaker gives an error beep code message, shut down the machine and add a stick of RAM. continue on like this until you get a no-boot scenerio. if you plug somehting in that causes the machine not to boot, remove it and keep it to the side while you continue to add more devices. that should give you a good idea where you stand.

now, if the worst happens and the motherboard and cpu only combination won't power on, you may try to remove the CPU and see if the motherboard will power up by itself. if it does not, then you should have a good idea that the motherboard is bad.

one last side thought.... you say this began with a USB device.... was this device being plugged into a front USB port that was connected to the case by a headder off the motherboard? in other words, not hard wired to the back panel of the motherboard? if so, you should probably unplug that headder before you begin troubleshooting again. i have had a motherboard blow out a usb headder like that before because it was plugged in the wrong way, and yet after i removed the headder the board worked fine.

good luck!

[undead_spectre]

I tried all that the main still dead so it must be fried

thanks for the help

I dont think giga byte will apply the waranty on this case so

ill get a new one