i have a HP Pavilion 513n. It is doing the following upon boot up.
It beeps and then makes a sound like a modem working for a few seconds, and that is as far as it goes.The fan is on the cd and dvd drives open there is a green light on the power supply above the plug and there is an orange light below the power button. I plugged into a new monitor that I know is working with a new cable as well. and the monitor is blank. Neither the cap lock or num lock buttons show and activity when pressed. The fan is running but it sounds a little fast to me.