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Multi-colored bars across the screen

Hello,

I have been having problems with my Dell desktop. It has been freezing at random times,with multi-colored bars appearing on the screen. They either flash or are stationary. The speakers buzz and the only thing I can do to fix it is manually restarting the computer.(holding the power button on the tower itself) At first, it was only when I played games or watched videos. Now it is doing it no matter what I'm doing. This is the computer.

Inspiron 545 (Early 2009)

Service Tag: <ADMIN NOTE: Service tag removed per privacy policy> | Express Service Code: <ADMIN NOTE: Express service code removed per privacy policy>

I've read that the monitor could be the problem,so I did what the forum suggested: unplugging the digital signal cable,turning on the monitor,and seeing what the colors were. 

The colors I got were white,red,green,and blue.(from top to bottom)

I want to know if it actually is the monitor before I buy another computer.

Thanks.


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