With the power off, no AC cord, try one more thing. GENTLY press all cards and cables "home."
I have a microsoft vista home premium desktop, and every time i turn it on there is a long beep that is about 5secs long and the monitor screens stays blank. I have no idea what to do. A few days ago it was giving me problems when it started up. It would load good, but it would take for ever for me to load something up like explorer. So i d/c everything and opened the desktop and blew out any dust that was there. But there were only a few. Can anyone help me out. I haven't used my pc for quit sometime now.