My wireless keyboard has stopped working, what can I do?

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I've installed a 3TB drive but it's showing as 750GB or 2TB What does the K stand for at the end of an Intel CPU model number? Can I use an AMD graphics card on my Intel system? Will a USB 2.0 device function on a USB 3.0 port? Can I use a SATA 3 hard drive on a SATA 2 motherboard? Will I invalidate my warranty if I upgrade my CCL built computer? I'm replacing the power supply on my computer and the specifications state a 24 pin however my motherboard only has a 20 pin. Does my system need any special requirements to use a Solid State Drive (SSD)? Do I have to fit memory in pairs? How can I type the Euro symbol that is shown on number 4 on my keyboard? When I press the @ symbol on my keyboard I get the " symbol instead (or vice versa). Can I connect my older keyboard to my new PC? What is a mechanical keyboard and what are the benefits? My wireless keyboard has stopped working, what can I do? What's the best way to clean my keyboard safely? I have multimedia keys on my keyboard however they don't seem to function correctly? What is the difference between a Laptop and a Notebook? What are the primary differences between a Notebook and a Netbook? Can I upgrade my laptop's CPU? How can I improve my laptop/netbooks battery life? Do you sell replacement power adapters for Laptops/Netbooks? Can I upgrade the hard disk drive in my laptop? The touch pad on my laptop has stopped working. I didn't receive any installation or Windows disks with my laptop. The wireless on my laptop has stopped working. Can I connect an additional monitor to my laptop? I've installed a new monitor and the graphics look distorted, squished or pixelated. Will my old monitor work with my new computer? How do I stop my monitor from turning off after a certain period of time? I'm looking at a monitor on your website which is listed as LED but then says LCD, is your description wrong? I've connected my monitor by HDMI but I'm not getting any sound. I have a dead pixel on my monitor; can it be replaced under warranty? Can I connect more than one monitor to my computer? Can I convert a DVI port to a VGA port to connect my VGA monitor? Can I use one monitor on two computers? What is the difference between contrast ratio and dynamic contrast ratio? What is Mains Networking? What's the difference between an Access Point and a Wireless Bridge? What is a NAS (Network Attached Storage) Device and how do they work? What is the difference between a Managed and an Unmanaged Switch? Can I use more than two mains networking adapters and do I have to use them in pairs? Can I share my USB printer with other computers on my network? How can I expand my wired network to allow for more wired devices? How can I tell if I require an ADSL or a cable router? What's the difference between 2.4GHz and 5GHz Wireless? How can I boost the range of my wireless network? Will my new printer come with ink? Can any printer be shared on a network? Can I share my USB printer with other computers in my home/office? Can I share my printer wirelessly with other devices in my home / office? How can I increase the lifespan of my ink or toner? Will my printer come with everything I need to connect it to my PC? What is duplexing and is it a feature I need? What is an MFP? What does 'Network Ready' mean on a printers specifications? I've just upgraded my computer's memory but my computer is showing less RAM usable than what I've installed (i.e. 8GB installed, but only 3.5GB usable). My optical drive (DVD, CDRW, Etc.) won't read or write media or is no longer visible in my computer but is shown in device manager. I can't find the product code for Microsoft Office on my new PC. I've entered my product key for Windows but it is telling me that it's incorrect. I've just installed Windows on my new computer but it's not connecting to my network. My new computer won't playback a DVD video. How do I start my computer in safe mode? How do I open a command (aka 'cmd') prompt? What is a Blue Screen of Death (BSoD)? How do I stop Windows from grouping all of my open Windows? Purchase Limitations