|Is it a CRT or LCD monitor? Does the monitor have an LED on or near the power button? If so, does it also stay on, stay off, change color or flicker? If it has an LED and it stays on (likely green), then the monitor is likely the culprit. It's receiving a signal from the VGA port but something (signal-wise) inside is dropping out. If it is flickering on and off with the screen, it's again likely something inside the monitor; probably related to the power supply (possibly even just a loose AC cord). If it stays yellow, it's never receiving signal from the port, meaning something inside the PC itself is probably at fault. |
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