Re: Need help Cant Boot
Compressed air from my understanding is the proper way to clean out dust on electrical equipment. So there's a tick for that. When you say cloth for fans (for CPU and graphics card?) and case, is this the outside or includes the inside as well? And was the cloth pure cotton or did it have some nylon or polyester in it (again this can build up a fair bit of static in it)
Working on carpet is a big no-no for electrical equipment as you can build up a lot of static on yourself and end up zapping components. Ideally, your computer should not be plugged into anything (the electrical cord provides an earth even it power point is turned off and so attracts static to the computer), sitting on some anti-static mat, and you should be earthed with some sort of ESD strap. Having said that, I've rarely worked on my own personal machines with all these precautions (though I've got no excuse if something dies on me).
Damage due to static discharge is one of those weird problems. It's only visible at the microchip level and is very erratic and inconsistent in behavioiur (can work perfectly one minute and then refuse to work at all the next with no pattern).
Just a couple of things extra you could check is make sure your graphics card, RAM and everything else is seated in properly and not loose. Apart from that you could also try isolate away from graphics card by testing another graphics card in your machine, or trying your card in another machine. But again becareful with Static when working on anything internal on a computer.
Also to help rule out software, is there any other hard drives you can boot from. For example I had a friend who was having lots or problems with their computer. Some of the techs were claiming no issue, or that it was software related. So I did a clean install of just the OS on another partition was able to recreate the issue within 30mins. The tech's then found it hard to blame anything else and soon found the hardware problem and fixed it.