I don't see a volume button on the gateway hd 2100 monitor. Is there a way to turn up the volume without having an attachment?

You may need a driver for the monitor, or a change of color resolution in settings. Right-click the desktop, or see if there's a graphics icon in the tray notification area, (near the time).

First warning, the cable attached to the front panel is really short and you can easily break it.
Look for bad caps as shown here:
http://s807.photobucket.com/albums/yy352/budm/Gateway%20FPD2275W/

Basic LCD monitor troubleshooting guide:

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

yes you can attach several inputs to this monitor,
the buttons are for ajusting the screen settings and setting the inputs from that tv
[email protected]

You have Gateway EZTUNE antitheft protection.
Please see below and you may need to contact Gateway.
http://www.fixya.com/support/r4558549-gateway_lcd_monitor_eztune_theft

http://s807.photobucket.com/home/budm/allalbums

black and yellow wires are for the switch
yellow and green are for the LED

Sounds like the capacitors have started to fail, common problem with these monitors.
Need more information. Contact [email protected] and I will try to help you out.

Either you have a problem with the back light or inverter.
When you disconnect the unit from its signal connection, you should see no signal input message.
If the unit flickers and then go out, while disconnected, you can rule out the video card and assume it is the back lights or inverter.
90% of the time, it is the back lights.

The first thing I would do if possible is hook up another monitor to the computer to see if that one works. If it does, then your monitor has gone bad. If it doesn't work either, then your video card has gone bad. Did you hear any beeps when you started up your computer? If you did, then this usually means there is something wrong with the video card. Also, sometimes the power button is turned off. Are there any lights lit at all on the monitor and are they green or yellow?

Same problem - unplug both computer and monitor - hold power button for monitor for 15-30 seconds...then power it back on and then power on the computer. Seems from other sites there is a power issue with the monitor - this worked for me.

It seems the the monitor is not supporting the resolution you have selected in display settings of operating system. therefore please minimize the resolution of display then check your monitor. hopefully it will work