For more information regarding troubleshooting issues check out
The Lenovo IBM Thinkpad T61 7658 was released in May, 2007 as an update to the T60 series. It is equipped with an Intel Centrino Duo processor and the operating system is Windows XP. The differences between devices in the T series is very subtle, but you can identify your device by looking in the lower right side of the screen. You should see Lenovo T61.