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USB inop?

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My computer has 2 USB ports built-in.
I have also added 4 more USB ports.
In the recent past, all USB ports worked perfectly.
Now, I am having somewhat limited accessibility.
All 6 ports recognize my mouse and (to a degree) my printer.
None of the ports will recognize a USB Micro SD adapter i purchased for use with my cell phone.
None of the ports will recognize the USB cable from my digital camera. (they did before)
I can print to my printer but cannot:
scan from my printer
use the SD port on the front of the printer (and have the SD card recognized as a removable drive by my PC

What can i do?
I have searched for driver updates but seem to be inept and can't come to a good conclusion.

Please help.

by the way - forgot to mention - my motherboard info:
SiS 735 chipset
4X AGP slot
DDR interface
Ultra DMA 33/66/100 function
AC97 Codec
AMR slot
10BaseT/100BaseTX Network Interface
ATX I/O Ports

Edited by anewzero, 17 April 2008 - 11:21 PM.

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A power-saving setting has been known to cause this, mysteriously changing itself from what it was. On some systems it has no ill-effect either way, whilst on others it does cause that particular problem.

Control Panel-->System-->Hardware-->Device Manager
Expand the section "Universal Serial Bus controllers".
Double-click each entry named "USB Root Hub" in turn, click "Power Management" tab & UNTICK (disable) "Allow the computer to turn of this device to save power". Click 'OK' to save the setting. Do that for each "USB Root Hub"that's listed. Restart Windows.

If that doesn't help, go here:

Edited by pip22, 18 April 2008 - 06:32 AM.

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First step, Start, Programs, Accessories, System Tools, System Restore. Create a restore point
and name it something like "Before USB Fix". This is to bail you out if something goes wrong during
the following process and makes things worse.

Create a file with NOTEPAD containing the following lines and save it as FIX.REG

You should have 3 boxes on the bottom in NOTEPAD.
1)Filename : fix.reg

2)Save as type: all files
3)Encoding: ANSI
If you do not change it from txt type to All files type, then the file will actually be
fixcd.reg.txt, this won't accomplish the desired result.

-------------------------- Use text after this line --------------------------------


-------------------------- Use text before this line --------------------------------

Double click on FIX.REG and say yes to the Merge Into Registry question.

Unplug ALL USB devices.
Open Device Manager.
View, Show Hidden Devices.
Uninstall all devices under USB Controllers.
Uninstall all devices under Disk Drives that you know are not present.

Uninstall all devices under Storage Volumes. Say no to any reboot prompts until you are finished.
Also, if a Storage Volume doesn't uninstall, ignore it and move to the next one.
If you have a yellow ? with unknown devices, uninstall all of the entries there as well.

When this is done, reboot TWICE....before you

Reconnect the USB devices and see if they're recognized properly.

NOTE: If you have a USB keyboard and/or mouse...plug in PS/2 style keyboard and mouse

Edited by happyrck, 20 April 2008 - 10:13 AM.

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