That is OK, many display card support this mode, VGA for main and HDMI for the second monitor.
Check this monitor
http://www.aliexpress.com/store/803292/210613195-355814388/Hot-Sale-10-HDMI-monitor-media-player-with-1024-600-resolution-support-VGA-input-HDMI-input.HTML
And film makers and camera users from follow forum say sth about HDMI and AV monitor
http://www.personal-view.com/talks/discussion/18/cheap-10-1024x600-monitor-with-battery-and-hdmi-input
use HDMI cable
Electronic cleaning wipes are used to clean an HDMI flat screen monitor. They have minimal moisture and use a cleaner which is safe for the screen's surface.
If you monitor has a DVI,VGA or HDMI, then you can.
When you use a VGA cable coming out of the monitor, the monitor is giving out an analog signal through the VGA connection. For the monitor to give out a digital signal, you need a DVI or HDMI cable. The VGA to HDMI cord just converts the analog signal into a digital signal so it's not completely useless, however the quality will not be as good as an HDMI to HDMI or DVI to DVI or HDMI to DVI
Basically you need VGA port to connect a monitor with laptop or now you can use HDMI port as well if your monitor has HDMI port too.
You can use any monitor for the mac mini as long as it has either a Thunderbolt, HDMI or DVI port.
You can use an iMac 5.8 as a monitor for your AMD built PC with an HDMI cord.
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The 2012 MacBook Air does not have a built-in HDMI port. However, it can support HDMI output through the use of a Mini DisplayPort to HDMI adapter. This allows you to connect the MacBook Air to an HDMI-equipped display, such as a TV or monitor.
Use an adapter which would connect to the monitor and PS4. Old monitors usually have a VGA port. Look for a HDMI to VGA cable
To play your PS3 on your Dell laptop using HDMI, you need to ensure that the laptop's HDMI port is an input, which is rare as most HDMI ports on laptops are outputs. If your laptop does support HDMI input, connect the PS3 to the laptop using an HDMI cable, then switch the laptop's display settings to the HDMI source. If your laptop does not support HDMI input, you'll need to use a capture card or an external monitor instead.
HDMI cables are used to run high definition pictures on a television or a computer monitor. The most common use is hooking them up to a video game console.