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Try a known good monitor on it maybe 2 if available. That proves its not the monitor. Try updating the video driver. It maybe a video issue.
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Try a known good monitor on it maybe 2 if available. That proves its not the monitor. Try updating the video driver. It maybe a video issue.

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if that doesn't work it's probably the card<br />

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if that doesn't work it's probably the card


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sometimes it can be due to a power supply that is running on the edge - check with another one, or calculate what power you need : &nbsp;<a href="http://extreme.outervision.com/psucalculator.jsp" rel="ugc">http://extreme.outervision.com/psucalculator.jsp</a> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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sometimes it can be due to a power supply that is running on the edge - check with another one, or calculate what power you need :  http://extreme.outervision.com/psucalculator.jsp [http://extreme.outervision.com/psucalculator.jsp]      

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At random intervals my Philips CRT 20&quot; monitor suddenly clicks and displays a random pattern that obliterates whatever I'm doing. &nbsp;The only way to get working again is to re-set the computer at which point the monitor is fine again. &nbsp;The last time it did this I hooked up a spare monitor which showed the same screwed up pattern, so I'm guessing my Radeon 9250 video card is dying, but how can I diagnose the problem? 
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At random intervals my Philips CRT 20" monitor suddenly clicks and displays a random pattern that obliterates whatever I'm doing.  The only way to get working again is to re-set the computer at which point the monitor is fine again.  The last time it did this I hooked up a spare monitor which showed the same screwed up pattern, so I'm guessing my Radeon 9250 video card is dying, but how can I diagnose the problem? 

Video card or monitor?

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.

Components

A monitor or a display is an electronic visual display for computers, usually comprised of the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size. They are connected to the computer via VGA, DVI, DisplayPort, Thunderbolt, LVDS or other proprietary connectors and signals.