My laptop (model "Dell Inspiron N5110") has four USB ports. Two of them work. Two of them don't.

The two ports that don't work have blue interior contact surfaces, instead of black/grey. A quick web search for "blue usb port" reveals that these might be USB 3.0 ports, and the other two USB 2.0. However, the method outlined here indicates I've only got 2.0, so colour me confused.

I've been trying various fixes for quite a while, without much success:

• Every setting in the BIOS that could possibly be enabled is enabled (except some anti-theft thing, but I don't think that's relevant).
• I've (re?)installed the "USB 3.0" drivers from Dell's downloads page. No dice.
• This answer suggests finding "Unknown Device"s in Device Manager and installing drivers for them. I don't have any unknown devices displayed, so I can't do that.

I would quite like to be able to use all four USB ports; troubleshooting assistance would be appreciated.

My laptop (model "Dell Inspiron N5110") has four USB ports. Two of them work. Two of them don't.

The two ports that don't work have blue interior contact surfaces, instead of black/grey. A quick web search for "blue usb port" reveals that these might be USB 3.0 ports, and the other two USB 2.0. However, the method outlined here indicates I've only got 2.0, so colour me confused.

I've been trying various fixes for quite a while, without much success:

• Every setting in the BIOS that could possibly be enabled is enabled (except some anti-theft thing, but I don't think that's relevant).
• I've (re?)installed the "USB 3.0" drivers from Dell's downloads page. No dice.
• This answer suggests finding "Unknown Device"s in Device Manager and installing drivers for them. I don't have any unknown devices displayed, so I can't do that.

I would quite like to be able to use all four USB ports; troubleshooting assistance would be appreciated.