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Try re-seating the video card. Check the video cable is plugged in tightly on the video card and monitor. The video cable maybe faulty, try a different video cable. The monitor maybe faulty, try a different monitor.
Hi, If a PC switches off the moment you plug in a screen its normally a indication of faulty VGA Card or damaged addon slot which is causing a short. Hard to say which of the 2 might be the cause only way to test is by installing other vga card and see if it still does the same.
When we say monitor doesn't turn on you need to check the power cable if it is correctly plug in, Check the monitor cord if it is plug in directly to your motherboard port. Some motherboard have installed external video card once you have install an video card you can plug your monitor cord to the video card. When the problem is still occur you need to disassemble the unit. The processor have problem it doesn't display. Remove it and clean after that put a thermal paste so that the heat from CPU will absorbed by the heatsink.
Were all these working fine together before or did you just replace something?
Did you try connecting the monitor to another PC? Try the pc on another monitor which works.
try unplugging the video card and plugging it back in. try without the memory, it should post and beep looking for the memory.
try without the harddrive.