System: Prebuilt Dell Vostro 460
MoBo: Dell Inc. 0Y2MRG A00
CPU: 3.40 gigahertz Intel Core i7-2600
RAM: 8GB
GPU: AMD Radeon HD 6450 (1x DVI, 1x HDMI, 1x VGA)
OnBoard MoBo Video: 1x VGA, 1x HDMI
OS: Windows 7 Professional
Hi everyone,
Here's my situation at work: I have a new Dell PC for one of our users that likes to run triple monitors. I know the GPU should only support 2 monitors at a time, regardless of having 3x ports (DVI, HDMI, VGA). I've enabled the onboard video through the bios. The strange thing I am encountering is if I have the 3rd monitor plugged into the VGA-out on the MoBo upon booting the PC, it will not detect and activate the 3rd monitor. It can't be seen through the display settings or CCC. The two running off the GPU work great. Now for the head-scratcher: If I hook a monitor into the MoBo HDMI port, all 3 monitors work (connection to monitor is via HDMI->DVI adapter). Furthermore, once the PC boots with a monitor connected to the MoBo HDMI, the MoBo VGA will magically start to work, at least until the next time the PC reboots without a monitor plugged into the MoBo HDMI. Once the PC reboots, the VGA connection is lost and can only be restored by rebooting with something in the MoBo HDMI port O_O
So, I know my easy answer for triple monitors on this setup is to simply ignore the MoBo VGA and use the MoBo HDMI coupled with 2 ports on the GPU. Me being me, I'm not happy until I understand WHY the MoBo VGA only gets recognized if something is first plugged into the MoBo HDMI upon starting the computer.
Any input is greatly appreciated!
Colin
MoBo: Dell Inc. 0Y2MRG A00
CPU: 3.40 gigahertz Intel Core i7-2600
RAM: 8GB
GPU: AMD Radeon HD 6450 (1x DVI, 1x HDMI, 1x VGA)
OnBoard MoBo Video: 1x VGA, 1x HDMI
OS: Windows 7 Professional
Hi everyone,
Here's my situation at work: I have a new Dell PC for one of our users that likes to run triple monitors. I know the GPU should only support 2 monitors at a time, regardless of having 3x ports (DVI, HDMI, VGA). I've enabled the onboard video through the bios. The strange thing I am encountering is if I have the 3rd monitor plugged into the VGA-out on the MoBo upon booting the PC, it will not detect and activate the 3rd monitor. It can't be seen through the display settings or CCC. The two running off the GPU work great. Now for the head-scratcher: If I hook a monitor into the MoBo HDMI port, all 3 monitors work (connection to monitor is via HDMI->DVI adapter). Furthermore, once the PC boots with a monitor connected to the MoBo HDMI, the MoBo VGA will magically start to work, at least until the next time the PC reboots without a monitor plugged into the MoBo HDMI. Once the PC reboots, the VGA connection is lost and can only be restored by rebooting with something in the MoBo HDMI port O_O
So, I know my easy answer for triple monitors on this setup is to simply ignore the MoBo VGA and use the MoBo HDMI coupled with 2 ports on the GPU. Me being me, I'm not happy until I understand WHY the MoBo VGA only gets recognized if something is first plugged into the MoBo HDMI upon starting the computer.
Any input is greatly appreciated!
Colin