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After running for a few hours, the video monitor starts flickering with coloured lines across the screen, eventually the screen goes empty with a 'No signal detected' message and then the monitor goes into standby mode. The PC still has power, the fans are still working, but no disk activity can be seen and it does not repsond to mouse or keyboard activity (e.g. CTRL-ALT-DEL). I have re-seated by video card and installed the latest driver from the AMD.ATI site. <br />
Once this behaviour has started, the machine will only run for 10 minutes or so before the behaviour repeats.
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After running for a few hours, the video monitor starts flickering with coloured lines across the screen, eventually the screen goes empty with a 'No signal detected' message and then the monitor goes into standby mode. The PC still has power, the fans are still working, but no disk activity can be seen and it does not repsond to mouse or keyboard activity (e.g. CTRL-ALT-DEL). I have re-seated by video card and installed the latest driver from the AMD.ATI site. 
Once this behaviour has started, the machine will only run for 10 minutes or so before the behaviour repeats.

Video signal lost

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.