I've also had that, The FN and brightness I've not determined, as I changed LCD panels, however, components in the LCD screen can be swapped out, cable and inverter and backlight (<-very hard to do!!) and the ATI graphics board is mounted to the mainboard, for the C600 they are affordable
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Connecting an External Monitor or Data Projector You can switch to an external monitor or data projector by two methods. 1. Connect the external monitor to the laptop's video port, power up the external monitor first and the laptop. The video information will automatically switch to the external monitor. 2. If you power up the laptop first then you can switch the video output to the external monitor by pressing the Fn key and one of the Function keys, depending upon your make and model laptop. You can also toggle between the external monitor or both LCD screen plus the external monitor or back to LCD screen only by pressing the Fn key plus one of the function key. Here is a list of key combinations for some of the laptops :- IBM ThinkPad = Fn + F7 HP and Compaq = Fn + F4 Toshiba = Fn + F5 Dell = Fn + F8
1.Confirm the Gateway notebook is not powered off or in standby mode. Tap the power button to turn on or wake the computer.
2.Check the screen brightness. Hold down the "Fn" key, then tap the up arrow on the directional pad to increase the brightness of your Gateway 400's display.
3.Toggle the notebook display. If you have an external monitor hooked up to the laptop, hold down "Fn." Press "F3" until the display switches to the laptop, or until both the laptop and the external monitor display an active screen.
your back light is going out. go but another screen for your laptop. search up ebay or amazon. and have sumone who knows how to do it replace it. asuming you dont know. if you do then the best of luck to you my frend. those things are a dewsy to replace. if you want a tutorial on replacing a screen i would sugjest searching up youtube. i cant acesse that website at the moment to give u a link but its not completly hard to do