My computer was working fine but now the monitor won't work and when I try to turn it on or off it states, no DVI signal to monitor, no VGA signal to monitor. What does that mean? All connections are tight, what should I replace first?
when I press the 'source' button it says 'monitor going to sleep'. The monitor is only about 3 months old and has worked fine for those few months. I unhooked the cable and hooked it again - I had to look it up online to see what cable it was and I came up with the one that had little pins in it and had to be screwed in. I will try to connect it again. Can that cord go bad or can a monitor go bad in just months?
1. Press a button to go into the monitor setup. if you can see this on the screen it's unlikely you have an issue (though it doesn' confirm the cord and input stage of the monitor)
2. Hook up to another computer. This is by far the best method of troubleshooting.
1. Swap video cards.
After this your troubleshooting your computers PSU, motherboard etc but it's very likely the monitor or video card that is the problem.
My money's on the video card. Whenever you upgrade, keep an older card for troubleshooting purposes. If you have onboard video, hook up to it instead. If you have multiple video sources (onboard or PCIe) you need to go into the BIOS after booting (usually "DEL") and change the order. If you had the cable hooked up to the onboard video but still had PCIe selected as the first video choice you wouldn't get anything out.
if you are just testing to see if it is the graphics card or monitor, you don't need to worry about drivers.
Because you don't know how to change a graphics card, I assume this is a prebuilt computer from an OEM like Dell, HP ... ? Or was it something you had a friend or someone build for you?
@photonboy: when removing drivers you want to use something that goes into the registry as well to remove possible conflicts. Add/Remove is not a good tool, and you should use something like RevoUninstaller.