I have many different AC adapters and power supplies for a variety of devices, ranging from small 5V/1A USB chargers to laptop power adapters and desktop PSUs. However, I often hear a … Why do some AC adapters and power supplies generate a whining noise, and what can I do about it?Read more
Samsung BF41-00322A PCB FAQs and Solutions
We first look at the following two pictures. Picture 1 is the “BIOS CHIP” of the circuit board. When we replace the PCB, we need to swap the “BIOS CHIP” with your … Samsung BF41-00322A PCB FAQs and SolutionsRead more
Why do some wifi routers block multicast packets going from wired to wireless?
I have worked with dozens of consumer grade WiFi routers, and they have been really hit-or-miss with this, though it seems to be getting better. Example of issue: A device that can … Why do some wifi routers block multicast packets going from wired to wireless?Read more
Why does Chrome sometimes download a PDF instead of opening it?
When I go to certain addresses of PDF files, Chrome downloads the PDF instead of opening it using its built-in PDF viewer. The page is then blank white. There is no problem … Why does Chrome sometimes download a PDF instead of opening it?Read more
Samsung BF41-00314A PCB FAQs and Solutions
We first look at the following two pictures. Picture 1 is the “BIOS CHIP” of the circuit board. When we replace the PCB, we need to swap the “BIOS CHIP” with your … Samsung BF41-00314A PCB FAQs and SolutionsRead more
Why does Excel not auto-update my equations anymore?
For some reason all of a sudden when I update cells in Excel, my equations are not being updated. For example, I have a simple equation =SUM(C4:C16). If I change any of … Why does Excel not auto-update my equations anymore?Read more
Why does Firefox use the “chrome://” protocol / schema in urls?
When I want to configure an addon, for example Ghostery, the tab shows a URL like this one: chrome://ghostery/content/options.html What does it mean? Does it have something to do with the … Why does Firefox use the “chrome://” protocol / schema in urls?Read more
Why does Linux’s UEFI entry disappear at each boot?
On an Acer PC, after installing any Linux system with any bootloader, I can boot it once, but after a reboot the UEFI Linux entry is gone. The Linux system’s file in … Why does Linux’s UEFI entry disappear at each boot?Read more
Samsung BF41-00303A PCB FAQs and Solutions
We first look at the following two pictures. Picture 1 is the “BIOS CHIP” of the circuit board. When we replace the PCB, we need to swap the “BIOS CHIP” with your … Samsung BF41-00303A PCB FAQs and SolutionsRead more
Why does virtualbox only have 32-bit option, no 64-bit option on Windows 7?
I have downloaded and installed the newest virtualbox 4.3.20 for my Windows 7 (64-bit OS), but when I want to install 64-bit Linux, the New->Create Virtual Machine only displays 32-bit option, no … Why does virtualbox only have 32-bit option, no 64-bit option on Windows 7?Read more