I have just purchased a computer, for few days it was running without any problems. But now I have a problem in my computer. I think there is a Monitor display problem because when I switch on my computer monitor never gives any display. I think there is no problem with RAM and graphics card. "HZ" is displayed in the box which moves all over the monitor. My computer configuration is intel 2.7 hz dual core, intel D946GZIS mobo, geforce 9600 GT graphics card and 2gb ram. What may be the problem? Any advice. Help will be appreciated.