HP OfficeJet Pro 6830 and Instant Ink review Expert’s Rating Pros Cons Our Verdict Any attempt to reduce the cost of running a printer is obviously welcome, but you need to think carefully about your printing needs before signing up for the Instant Ink service. If you have light printing needs then you may well find that you’re better off simply buying replacement cartridges just as you would for any other printer....

How to fix a laptop’s graphics It’s not always easy to upgrade alaptop, so what do you do when itsgraphicsfail? Here we explain how to fix a laptop’s graphics. A reader wrote in to Helproom to ask the following question: “I have an HP Pavilion dv7 laptop, which is around five years old. It’s running Windows 7 Service Pack 1 and has a 64-bit quad-core 2.3GHz processor with 8GB of RAM....

Viewsonic VX2880ml 4K display review Expert’s Rating Our Verdict There may be some limited application for using this display as a 4K television, when combined with an external set-top box, in spaces where a regular 40-inch 4K television will not physically fit. But we would not describe this ViewSonic as fit for purpose as a computer monitor due to its unacceptably low 30 Hz refresh rate. ViewSonic is joining in with the new wave of 4K-class UHD displays with the VX2880ml, a 28-inch budgetmonitordesigned, says the company, for entertainment....

What are the two blue ticks in WhatsApp? An update to WhatsApp means you’ll start seeing some blue ticks appearing in message threads. Here we explain why and what they mean.See also:Beware of the latest WhatsApp charging hoax. So far, there has been no way of knowing whether a message you’ve sent via WhatsApp has been read by the recipient. However, that’s about to change with a new version which includes grey and blue ticks....

NVidia GTX 970 vs NVidia GTX 780 Ti vs AMD Radeon R9 290X Our Verdict A lot of the decision here comes down to price and availability. There’s actually very little wrong with the 780 Ti. Kepler may be older technology, but cards with the 780 Ti are immensely powerful. At the time of the 970’s launch in October, the 780 Ti was still rather expensive. But prices have come down, and if you can get a card for between £300 and £340, the Ti is still a superb card....