Computerhilfen tech-tips

The Logitech K750 keyboard has two solar panels on the top that harness the sun's energy to power the keyboard for days, thanks to its rechargeable battery. This design allows you to continue using the keyboard even when sunlight is no longer available. However, like all rechargeable batteries, it will eventually need to be replaced.To replace the battery, turn the keyboard upside down with the keys facing the table. You'll notice a small opening i... Read more...

If you want to change the language of Google Chrome, you don't need to reinstall the browser. Changing the browser's language is very easy, and adding new languages is also very simple via the Preferences. There you will find an item called 'Languages'. If Chrome is set to a different language, follow our video guide and look for the icons and buttons to change the language.The different languages installed can be selected in the language selection and... Read more...

When you try to run the built-in Windows disk diagnostic tool CHKDSK ("Check Disk") from a regular command prompt, you may receive an error message that says you don't have sufficient privileges:"Access Denied as you do not have sufficient privileges or the disk may be locked by another process. You have to invoke this utility running in elevated mode and make sure the disk is unlocked."If you have administrator rights, you can work around this... Read more...

Websites protected by Cloudflare's web firewall may recently display [email protected] instead of an email address. This is to protect the mailbox from spam; the real address is supposed to be displayed in the browser via JavaScript. This does not seem to be working for several major browsers at the moment, so instead of the address, [email protected] is displayed, with a link to an explanation.You can work around this by turning off the Cloudflare... Read more...

By default, the Linux screenshot tool scrot in newer versions doesn't overwrite an existing file, even if you specify a filename. Instead, it creates a new file with an appended number, such as _000, _001, or _002. However, there is an easy way to make scrot overwrite the existing file with the given filename. This is particularly useful if you want to replace an old screenshot with a new one.To achieve this, simply add the -o option (for "overwrit... Read more...

No protocol specifiedError: Can’t open display: (null)Failed creating new xdo instanceIf you're using a Linux system, you might encounter this error message: "No protocol specified - Error: Can't open display". This might occur when trying to start a graphical application. The error indicates that you are unable to access the X server, which is responsible for displaying graphical content. In our example, we try to run the xdotool. ... Read more...

Unlike Apple's macOS system, drives on the Raspberry Pi with Raspbian cannot be safely removed or ejected directly from a folder window: On the Mac, there is a button for ejecting the drive in the folder's view. This is missing under Raspian: Here drives are also shown as folders in the sidebar, they are usually mounted under "media".To eject and unmount these drives safely, there is the possibility to do this from the console. But you can also ej... Read more...

UnBounce is a practical, but often not very flexible editor for websites and landing pages: With it, individual pages can be clicked together with little effort. If you activate the mobile view, UnBounce distinguishes between desktop computers and mobile devices such as a smartphone or a tablet: You can also create completely different pages for both sizes.However, you often want to know whether UnBounce is currently displaying the desktop view or the ... Read more...

To change the volume of the Raspberry Pi and turn the computer up or down, you don't need a mouse or screen: This can also be done over the network via SSH. To do this, connect to the Raspberry (tip: Connect via SSH and activate SSH). Then you can activate the volume control with the following command:alsamixerThis starts the setting program shown in the picture above. Use the arrow keys (up and down) to change the volume: this is also shown gr... Read more...

The new Raspberry Pi 4 seems to have problems with the WiFi, if a screen with a high resolution is connected via HDMI: The small computer even has two Micro-HDMI outputs in version 4, which can deliver a 4k image. If the Raspberry Pi is to be used as a media player on a high-definition TV, however, it is better to connect it via LAN cable: With the Pi 4 this is now also possible with Gigabit.At higher HDMI resolutions, the video signal should inter... Read more...