My computer monitor doesn't come on when i turn my computer on. the monitor says no vga input and goes to sleep. what's the problem with my computer?

Answer 1

First, check your connections between your monitor cable to your VGA socket. BIOS setting, if you know how to configure it may help but if only your screen projects it.

Sometimes it's a driver issue, a conflict between your current operating systems (i.e. "Windows" , "OSX" , "Linux") and the program that tells your system how to interact with plugged-in components such as monitors. Typically, this only affects the advanced features availability of the hardware, not the basic functionality so it would most likely still operate to some extent in the event of a driver conflict.

In this case, however, you're probably experiencing a faulty graphics adapter, the hardware tech installed either on the motherboard or in a PCI slot on the motherboard. This is the hardware bridge between your monitor and system that determines, among many other things, the type of connection your monitor will use (vga, hdmi, usb, etc...) and graphics resolution.

If you are using a PCI-based graphics adapter, ensure that it's seated properly in the PCI slot on your board. Also check your system specifications (manual) to determine in which PCI slot you should install the graphics adapter. Some systems are specific, especially when there are other PCI-based components installed.

If still experiencing no connectivity and you also have an onboard graphics adapter (i.e. your PCI-based adapter is secondary), you may be able to switch the connection back to primary on the board. If the monitor functions while plugged into the primary adapter, you may either have a faulty PCI-based adapter, a faulty PCI slot or simply a setting in bios or within the operating system that's forcing the connection to work only with the integrated onboard graphics adapter.