If you turn the computer on and it turns itself off as it's loading Windows, you could have a couple of issues -
overheating due to dust buildup (most likely)
power supply failure (if you have a dedicated video card and the system kicks off when the driver initializes, this could very well be the case)
component failure
If it's under warranty, get it fixed under warranty.
If it's not, do this - try cleaning the inside of your computer case first; if it's a desktop, pop the side panel off and have at it with a can of air, and if it's a laptop, blow the vents out with a can of air. If that doesn't do it and you have a dedicated video card (as in your screen isn't connected to the motherboard), get a new power supply for the system and see what happens. If that doesn't fix it, then take the machine to a repair shop.
No signal indicates that the monitor is working, but its not getting the image from the computer. You may have a problem with the CPU. Have Geek Squad check it out
Comments
If you turn the computer on and it turns itself off as it's loading Windows, you could have a couple of issues -
overheating due to dust buildup (most likely)
power supply failure (if you have a dedicated video card and the system kicks off when the driver initializes, this could very well be the case)
component failure
If it's under warranty, get it fixed under warranty.
If it's not, do this - try cleaning the inside of your computer case first; if it's a desktop, pop the side panel off and have at it with a can of air, and if it's a laptop, blow the vents out with a can of air. If that doesn't do it and you have a dedicated video card (as in your screen isn't connected to the motherboard), get a new power supply for the system and see what happens. If that doesn't fix it, then take the machine to a repair shop.
No signal indicates that the monitor is working, but its not getting the image from the computer. You may have a problem with the CPU. Have Geek Squad check it out
Either the computer or the video card is dead.