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21 ATTO Technology Inc. ATTO ExpressSAS Host Adapter Installation and Operation Manual
4  Troubleshooting
This chapter contains solutions for the most common problems you might encounter. If you need additional 
assistance, please refer to the ATTO Technology web site (
www.attotech.com
) or contact an ATTO 
Technology authorized representative. 
General suggestions
•  Check each cable connection on every device.
•  Verify all cables are in proper working condition. 
Loose or broken cables are often the cause of 
errors or problems.
•  Check that devices are plugged into an AC outlet 
and are turned on before you add power to your 
computer.
•  Ensure you have the latest driver for your 
operating system and that the driver is installed 
(refer to 
Install Drivers
 on page 5).
•  Ensure the ExpressSAS adapter is installed 
properly in the computer (refer to 
If the RAID adapter is not accessible
1
Open the ATTO
 Configuration Tool from the 
ATTO Utilities found on the Installation CD or 
download from the ATTO web site. Refer to the 
ATTO Utilities Installation and Operation 
Manual
 for additional information.
2
If the adapter does not appear in the 
Device 
Listing, make sure it is properly seated in the 
PCI slot. 
 a.  Remove power from the PC.
 b.  Remove the case.
 c.  Check the PCI slot.
 d.  Replace the case.
 e.  Apply power.
Note
If it is properly seated and devices are still 
not accessible, contact an ATTO 
Technology authorized representative.
3
Verify the driver is loaded. 
 a.  Click on the adapter name in the 
Device 
Listing to view the Basic Info screen.
 b.  If the 
Driver Information section indicates 
Unknown: driver not loaded, reinstall the 
driver. Refer to 
Install Drivers
 on page 5.
 c.  If reinstalling the driver does not fix the 
problem, contact an ATTO authorized 
representative.
4
Reset the NVRAM for all channels to defaults 
and reboot. If the problem persists, contact an 
ATTO authorized representative.
Note
For OS X systems, when calling ATTO 
Technical Support, please have a printout of 
the IOreg listing and output from the Apple 
System Profiler available.