20 Most Recent A4tech KBS-21 (KBS21) Keyboard Questions & Answers

Sounds like you need a new keyboard

In general, either a single tap on the "prt sc" key, or a key combination such as Ctrl + Prt sc will copy the screen to the clipboard. Kindly reply as to which one of those, or one of the following methods below, work for you. https://www.digitalcitizen.life/screenshot-windows/

did you download the drivers and software. https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk02yUN4qtSIiLlzYT8c8foDVfA6sRg%3A1615353910747&ei=NlhIYM6ELYLctQatsqioBA&q=a4tech+pk-910h+windows+10+driver ..

Remus Calinoiu wants answers to this question NO PC stated, so gets hyjacked anyway. if it is a PC and I see those are 32ohm 3.5mm phone plug electromagnet head phones. The problem is caused in this case by bad connection or the headphones shielded, wire 3.5plug is damaged If you try other phone (any) and it works ok,you know it is not the PC problem. buy $1 earbuds at a Dollar store and prove that, for $1 the other cause (I cant see you or it) if the head phone wires are long and land near a WALL wort transformer power pack it sure can hum. the cure is easy move the PACK away from phone lead in wire. even desk lamp power pack can do that.

try this https://launchpad.net/ubuntu/bionic/+source/libwebcam download the driver, its kinda generic

no PC stated no OS stated or windows version if windows at all. A4tech makes many models, none stated (sticker on bottom hint) vast models, even old PS2 keyboards from long aga to USB keyboards, seem time to buy a new keyboard if not wireless if wireless, the batteries are dead , like most are now... right. G9300 is wireless , THAT wild guess of over 100 models made by THEM> if USB test in on 2nd PC, if works there try all USB ports on the bad PC. if all fail then your OS is corrupted or the USB port drivers or the keyboard driver is corrupted. is OS windows 7/8/ or 10 , older versions not worth using, a fact.

https://www.manualslib.com/ Find a manual and see if they have a site to reorder the receiver

Have you read the instructions. In the software what you might be looking for is either a flip button or something to do with the 360 rotation feature

windows 10 some times installs the wrong drivers, there is a windows fix https://www.laptopmag.com/articles/disable-automatic-driver-downloads-on-windows-10 follow this information but it will turn off driver update, remove the driver windows has installed and turn off pc/laptop and reboot, when systerm is running install the driver from the cd, it should install and windows will stop trying to update this, if you need to update any drivers in the futer do this maunaly in device driver settings.

http://www.a4tech.com/driver.asp?m=s1 Go to the A4 website and use the drop-box to find your model and download the driver