USB ports, two dont work

Hi
For my new HP envy 2.4 GHz it has 4 usb ports. One is supposed to be used as a usb charging port. Of the remaining three ports, two work fine. The last one does not. Any ideas why this is?
The two good ones are on the right side of the computer. The other two are on the left side.
Thanks!
Doug

Hi,
4 ports are USB 2.0.
4 USB 2.0 ports (4th shared with eSATA port)
1 eSATA + USB port (left port)
HP Pavilion dv7-4131sa Entertainment Notebook PC Product Specifications | HP® Support
The difference is that the left ports are integrated on the motherboard, the rights USB ports are a card with a cable that can be replaced in case of failure.
If you have a Linux distribution (Ubuntu, Mint...) you could use in live mode (without installation) to test the USB ports
Manual (page 80-81)
http://h10032.www1.hp.com/ctg/Manual/c02642701
related topic
HP PCs - Troubleshooting USB Connections (Windows 7) | HP® Support

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http://
HELP ME
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