computer help

ok so i decided to open my computer and give it a clean today... full of dusty dust, anywho when i put it back together and turned it on i got a no signal message on my screen, also my mouse and keyboard do not receive any power to light the laser/LED's

the things i have tried to rectify this problem is blow out connections with an air brush/gun, and basic trial and error fixings, so anyone have ny idea what this problem might be, cos personally i thin the connections on my MB are dead

When you turn the computer on do any of the fans spin? Can you hear any hard drive activity? Also you should never use a brush on any electrical component as they tend to accumulate static electricity which will ruin whatever it touches.

Try this...you see a battery inside the computer (motherboard) take it off...then touch the metal where the battery takes the power something like that...touch it with the side of the battery...

__________
[__________] ..... the side XD...touch the metal in the middle where you put the battery...on the round thing...for about 10-20 secs...then put it back...just try it im not sure..

coz when my keyboard didnt work although it was plugged...i called dell and they told me to do that...after that it worked...but i dunno anything about computers...just try it...im not sure though if we have the same motherboard....XD

nachbar read the thing again i said AIR brush also i think i have found a reliable source of help

Sorry but when I saw the word brush I just assumed it was some sort of object that has bristles used to clean or groom. Never heard of an air brush before so I thought you were talking about something like a vacuum cleaner hose with a brush attachment.