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Check the led light indicator of your monitor. Is it green or blue? Or is it yellow or orange? If it's green or blue, then there's no problem with your monitor. If it's yellow or orange, you may have a defective or dirty graphics card or memory.
Open your system unit chassis, remove the video card (if you have) and the memory or RAM from their slots. Clean the gold contacts or pins with a rubber pencil eraser, then wipe it with a lint-free cloth to remove the debris. Then put it back again to their slots. Test.
There's a lot of instructional videos on youtube on how to remove these parts properly, so better watch them first if it's your first time.
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With any monitor, check the following to determine if the issue is MONITOR related or COMPUTER related.
1. Verify the monitor is receiving power - use a known good power outlet and plug it into the monitor
2. Samsung monitors have a light on the power button - are you getting any color light from this? Orange means it is in "stand by" mode and is waiting for the PC to send it a signal. Green means the monitor is getting a signal from the PC and the monitor is on.
3. With the monitor on, press the buttons on the monitor to bring up the OSD (on screen display) that changes the monitor settings. If you have a green light on the power button and press one of these buttons (AUTO works best), this will display the monitor adjustment options on the screen.
If you see the on screen adjustments, your monitor is working and the issue may be with your PC. Move the monitor to another PC and verify the monitor is working correctly.
IF you don't see anything on the screen and the power light is green, the monitor has failed.
This could be the lights that illuminate the screen have failed (something that happened to my Samsung Syncmaster monitors after about 6 years of use) or the screen has stopped functioning. In either case, replacement parts are hard to find and a monitor swap is likely.
What is the color of the LED power light on the monitor? is it GREEN or AMBER(orange) - this is a display problem. The Display adapter(video card adapter) may be faulty or not installed(seated) properly on the motherboard. If the display adapter is built in the motherboard, you may consider resetting the BIOS by taking out the battery and putting it back on or use the CMOS reset jumber found on the motherboard.
If you look at the monitor there will be an led light on the front that is always orange or yellow when the computer is off but still connected to the monitor. This led will turn green when the computer boots up, sometimes even showing a "no signal" display before boot. If you see the 'command line' text during the boot process (video info, BIOS version, POST text, etc) then the monitor is being recognized by the computer. If that text goes away and the led goes back to orange then it is a driver or operating system problem. Pressing whatever key is prompted at the lower left of the display, if you have a display, like F1, F2, F10, Delete or whatever will get you to the setup program and all is good with the display/computer connection and a green light will stay on. If you never get that green led light then either the video card is bad or not seated properly