My Mag 19inch LCD monitor does not display the bios post during boot up but only starts displaying when Windows boots. My graphics card is a Sapphire 3850 256meg. When I switched monitors to a Samsung 22inch LCD, the bios post is visible and everything is normal. I then switched graphics card to a Sapphire X1950Pro and tried this with the Mag monitor. I was able to see the bios post again. The problem is confined to the Mag monitor and the 3850 graphics card which only displays once Windows starts and does not show the bios post. The cable used is an 18pin single link DVI cable. Do you think a dual link cable might solve the problem?
I have no experience with the DVI links because such technology is still unavailable here in Argentina. We have DVI video cards but finding a suitable DVI monitor is another (long) story. I think that your card (that has 2 DVI ports) is initializing one port first (the primary one) and then, when windows starts, it initializes the other and outputs video from both ports. Try connecting the monitor in the other DVI port. If your card has a VGA output, the VGA gets initialized first.
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When does it happen?
During Self test? Try this by unplugging the cable that connects to your tower and see if the self test runs. if it does, then your monitor still works. If it doesn't you might need to replace your LCD
During BIOS? If it works then your monitor still works. If it doesn't you might need to replace your LCD
During Windows? then you might need to adjust your display properties or reinstall your video card drivers.
You might have it connected using the wrong port on the back of your computer. The monitor will display the BIOS and post messages but once it gets to windows it will turn off. The other possibility is you need to either reload the driver for your video card, change the default display device in the bios, or replace your video card.
Don't worry about it. During boot time, the input to the monitor is set to a different resolution (640X480 for plain text). The monitor remembers settings for different resolution inputs, and the position is wrong but it's not a monitor problem as such. You could adjust the position and the display would be properly centered, but it's not worth the effort. Once the system starts Windows and the resolution switches to your normal settings, the display looks right. Once in Windows, you can't even set the resolution low enough to adjust the monitor; Windows won't go below 800X600 pixels.
Go to the Control Panel and click on Display, the the Settings tab. then change the screen resolution to 1024 X 768 or higher resolution.
The higher the resolution the smaller the Icons will be but you will be able to display more information on the screen.
If the problem related to wrong PC (video adapter) settings, during boot-up, right after BIOS started, press F8 button to call OS startup menu, choose there 'VGA Mode', then OS will be loaded with basic VGA settings (640x480 250 colors), so you will be able to set other display settings, proper for your monitor. But all that, of course, won't be possible if the monitor itself shuts down, that would be completely different story. Confirm what exactly is wrong, Display Settings or the monitor itself?
The BIOS is sending the display information to the monitor but, when you turn your PC on, the LCD will be sleeping and it will take 1~2 seconds to wake up when receiving the display signal. The monitor is working and even if the BIOS messages aren't displayed, you can still press the correct keystrokes to get to the SETUP screen or press PAUSE in the keyboard to see what's going on in the POST. If your LCD has a bicolor LED indicating the status (Standby/On) keep looking at it, when the LCD gets the video data, the LED turns instantly from amber to Green or blue even if the screen is still black. This way you can have an idea when the LCD gets the initial video signal and to press the keys accordingly. Your PC will also delay the video output from the secondary video card because it's detected after the onboard card.
Speak to HP/Compaq they will be able to advise. They are usually pretty good with hardware faults. You probably have a three year warranty on it so take advantage. Your mobile phone is not by your pc or any other wireless phone?