Mini USB Connector

I have a number of gadgets ( camera’s phones, gps…) that have come with their own mini usb cable to attach to the computer. (mini usb for the device / standard usb connector for the computer) They seem interchangeable , is there any downside to using a cable that didn’t come from the OEM

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I have an old PC desktop that has a single adapter vga adapter. I’d like to add a second monitor to this machine (vga). I have an open USB port and was wondering if a vga(male) to usb adapter would work or if I need a new vga card with multiple adapters. The other thing I was wondering is if off the mother board there is a 15pin male. Would that work if I gender changed the male vga that come on the new monitor’s cable?

As you can tell I only know enough to be dangerous.

Thank you for your help.

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I’m sick of all these cameras with non standard usb connectors. From now on I’m only buyihg cameras that my existing plugs can use
Edit:

According to one person selling 5 pin mini-b usb cords on ebay, these things connect to Sony, HP, Canon, Fuji and Olympus cameras. I’m pretty sure I’ve used a Fuji that did not have that connection, but I’m sticking to these brands from now on. Kodak definitely does not use a standard cable and if I lose the cable that came with the camera, it will be a big pain the regain the ability to charge it or get pictures out.

I’d rather not always pull the memory card out just to get pictures.

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Have a mouse that came with old computer. It worked on the “serial/parallel” port.

My laptop has USB ports only.

1. Is a connector/convertor available that i can plug into the USB port and connect my previous mouse with the connector at the other end?

2. how much would it cost?

3. Am I better off, simply just, buying a new optical mouse (or any other mouse) that directly connects to the USB port?

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