Does it beep at all? Is the monitor snugly connected to the back of the video card? You sure everything inside the machine is snug?

What Did you use to Dust !!
Try removing and reseating the ribbion cables also !

Hi cscgal,
no, it does not beep at all, after it power up, hd light up for a sec, and goes off, then the computer just sit idle, with no screen and nothing.
checked on the video card and cable, its fine.
Took off all the cards and RAM and only the video, still would not go through POST.
Check everything, they all sit good.
Everything happened right after I dust clean inside.
I was wondering if I static kill the CPU, since I still got the power to the motherboard, it should be fine.
Please advice.
John

Hi, caperjack,
I clean it with a light brush, the paint brush, that is all i did, and i do that all the time too.
but this time is different, it give me a challenge.
Thanks for any input. This is my first time on the site too.
John

Did you remove and clean the CPU ,or just the fan .
There is the old process of elimination,removing all addin cards and booting computer and replacing one card at a time .also if you have more than one stick of ram remove one ,boot computer ,if nothing,replace and remove the other one

Hmm ... a brush ... is it possible for loose brush threads to get stuck on the motherboard or CPU breaking a circuit somewhere? (Very long shot)

Hello cscgal,
I will go back to give a closer look tonite, hope that's what happened. I will let you know how thing goes.
John

Hi caperjack,
I just cleaned the heat sink and the fan, and I also take every single add-ins and replace it one by one with no luck. the funny thing is it will not even get through the POST with the beep, so I am really puzzle with this one and I couldn't do must without any kind of interface, no graphic or command prompt.
I even removed every single thing and the CPU and still without any error sound and message, all I get is electrical activity, CPU fan running and that is it.
However, I will get a closer look on the motherboard tonite, hopefully with some good news tomorrow, one way or the other, thanks for the input and will let you know the result.
John

I had a similar problem yesterday. Basically I just took the case of my PC and attempted a boot again. It then beeped but made some strange noises. Disconnected from the mains again. Disconnected all fans (apart from the CPU one) and the CD drives. Rebooted. Beeped and got an error (getting there). Added each item back in one at a time (disconnecting and rebooting between each item). By the time I got to the end it works as good as before (Except I've lost sound somehow) Might have just been good luck but might be worth a try.