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You have to hold the Fn key and then press F4. There should be 3 settings. Setting 1. Computer Monitor. Setting 2. Computer Monitor and External screen and setting 3. External Screen only. The order changes sometimes but pretty much all laptops follow this sequence in some way.
the external speaker vol will be controlled only from the master vol on screen (driver controlled)...or from the amplifier from the speakers....you might try to choose the output from the driver settings...but I still do not think you will be able to control the vol from the laptop buttons..the out signal does not route via the laptop internal amplifier ..and this is the issue ...but Im not sure and I will study the model for you ..and brb ..
have you any other A/V ports out ie Svid etc if so try that via an A/V lead, if that works reset your bios settings to minimal settings, if that doesnt work search the 'net someone somewhere has had the same problem! try shining a flashlight/lamp onto the screen whilst booting up, if you see anything on the screen then your inverter is definatly gone and yes it could still be your inverter! your laptop may have software/hardware issues with an external monitor?
Hi it look like your laptop was droped down, can you check the conection inside the screen ?that is hapen wen the conection of the screen is not ok.open the screen and check the conection on the back of the screen,take care to not damage the small cell on the screen cose if you do you will have more line on screen.that is the way i fixed that matter on a few laptop's.
try to desconnect or unplug your hard drive, if you see a black screen with a bunch of white letters, you hard drive is crashed, if not try to conect a second monitor (external) tru you vga connector, if work fine you have a lcd problem===>>>reemplace asap.