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They are actually two separate issues: I will assume that you have funtioning speakers or headset. 1) first fix your main audio problem by re-installing your sound card driver that would normally come with your PC/Laptop or (external) Sound Card. This should fix the issue with your software volume control 2) second fix your Keyboard volume control: if after fixing your audio system driver previously, this is still not working, then you will need to re-install your Keyboard 'soft' key driver that control the extended function of your specific keyboard: the driver may also be included as part of your PCLaptop but may also have come with a 'third party' non-orininal keyboard. Hope it helps & good luck!
Sounds like your screen went out. Try hooking a monitor into the blue port on the back of the laptop. If the screen shows up, the LCD probably either came disconnected inside or the inverter went out. This is a simple fix for a qualified professional. If not, press fn and F11 (the f key with a picture of a box with an arrow in it). If the screen still doesn't come on, it's most likely the video card or motherboard, which usually is more expensive than the computer to get fixed.
I will assume you have checked the cables etc to make sure they are not bad in any way and skip to the more usual problems
Make sure they are powered up and the volume is about half way if they have a separate volume control. (not all flat monitor do)
First check that they were not MUTED by accident. A red line through the speaker icon would indicate this and you would just need to untick the MUTE box.
If its not as simple as that then carry om below.
OK now you need to call up ether the sound card application or preferably the windows volume control from the bottom tool bar.
Click Open Volume Control.
A box with sliders in should appear. make sure that volume control, wave, sw synth, aux, cd player, line in are all about half way and that none of them have ticks in the box at the bottom.
If any of those are missing click options then properties from the top left and put a tick besides any that were missing (nothing else)
Now close the slider box.
Put a normal music CD in your CD/DVD player on the computer and set it to play with windows media player.
You should now have sound out of the speakers.
If all went well you are running but if not you know just may want to check the hardware properties and should there be an exclamation mark against any of the sound hardware you know where the problem is.
This can in most cases be fixed with an updated driver for your sound card.
YOU MAY NEED TO DOWNLOAD A NEW AUDIO DRIVER OR INSTALL A SOUND CARD IN YOUR SYSTEM.
FIRST go in control panel select sounds and audio devices OPTION and click on adjust volume look to see if your volume is up and make sure the mute option isnt on if this doesnt work proceed to find audio driver via the internet.