The monitor I have is an Acer 17″ V173 LCD monitor. It will say no signal and other times says input not supported. But when it ways no signal, my pc is still on , but the monitor is black.
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Both those messages are generated by the monitor itself, not your operating system. You probably will get the first message when the video cable is not connected at all and you then power on the monitor, after a few seconds. The second message indicates the settings used for the monitor in the operating system are not supported by the monitor.
…….
If the monitor works fine with another computer, and if your video is fine while booting BEFORE Windows is supposed to load, you probably need to re-set the Monitor type.
For 2000 or XP…
See response #9 here:
https://computing.net/answers/ha…
starting at….
Boot into Enable VGA mode.
Note – that’s missing this –
Remove any bootable CDs or DVDs you have in drives.
Press F8 repeatedly while booting, don’t hold down the key, starting very early in the boot.
When the Windows boot choices menu appears, choose Enable VGA mode.
……..
If the monitor works fine with another computer, and if you have NO video at all while booting, something else is wrong.
Some computers have both onboard video – a video adapter built into the mboard – and video from a card installed in a mboard slot.
In most cases, installing a PCI-E X16 or an AGP card in a mboard slot automatically disables the onboard video. If you have the monitor plugged into a video port for the onboard video when the card is plugged in, there is no video at all from the onboard video port.
In the case of a mboard that has onboard video and also has Hybrid CrossfireX support (AMD main chipsets) , or Hybrid SLI support (NVidia main chipsets), or Hybrid Multimonitor support (Intel main chipsets), if you are using a video card in a PCI-E X16 slot, if the video chipset on the card in the slot is NOT one of the ones compatible with the Hybrid video feature, by default you will NOT get any video from the card in the PCI_E X16 slot, and the onboard video is still enabled. You must change at least one if not two settings in the bios Setup in order to get video from the card in the slot and disable the onboard video.
Other causes………..
– for any system –
– you’re experiencing ram error problems, which are almost always caused by the ram having a poor connection in it’s slot(s), or by the bios settings for the ram being incorrect, or by you using ram modules that are not 100% compatible with using them in the mboard or not compatible with being used along with other ram modules if you have more than one module and more than one part number of them.
While booting you may hear the normal one mboard beep, or no beeps, or a pattern of beeps that indicate a memory problem or no ram detected. .
– rarely
– the mboard has developed failing electrolytic capacitors
– the mboard is otherwise defective or damaged.
— for a desktop system
– you’re having power supply problems – the mboard is not booting all the way because of that – in that case you do not hear the normal one mboard beep while booting.
– for a laptop, if the laptop has been used a lot
– your AC adapter, main battery, or the jack on the laptop the AC adapter plugs into, or a small power related board inside the laptop, has a problem.
– the built in display’s backlight (CCFL) or the voltage inverter that supplies it with high voltage is in the process of failing or is dead, or there is at least one broken wire between the video adapter and the display, usually right where the wiring passes through the hinge area. Usually an external monitor will work fine in that case – there’s nothing wrong with the video adapter.