Try this To reset your iPod with a click wheel, follow these steps: Slide the Hold switch to the locked position and then slide it to unlocked again. Press and hold the Menu and Center (or Select) buttons together until you see the Apple logo (about six to eight seconds). You might need to repeat this step.
check the Lenovo website to ensure the wrong driver is not installed on the laptop, if so try to use an external mouse to access the website and update the driver. Second possibility is the "Red Nipple" on the keyboard has become physically trapped , try to reset this by vigorous manipulation (Wiggle it roughly) clockwise and then counter-clockwise. These are the most frequent causes of your problem, and they will cost $0 to test.
If the laptop appears to start powering up,clicks and the recycles the power repeatedly, the problem may be related to memory, check memory speed is correct for the laptop. Check laptop spec sheet for laptop. I have seen this occur when the wrong speed is installed in Lenovos before. The other most common problem is the laptop drive is dead, and clicking while trying to locate the MBR.
Due to the nature of the device, it is not recommended that you attempt to repair power transformers. A replacement MagSafe power brick can be purchased from Amazon $18 - $80 depending upon power level and if OEM or Genuine Apple part. As the casing is fused closed, opening requires use of a saw blade therefore can't be put back together cleanly.
I have a late 2007 macbook pro, i was able to upgrade the ram to 8Gb and have the system run smoothly, however the extra ram raised the working temp by over 20' C. I reduced my ram to 6Gb and am now happy with a satiable ( and cooler) system. Hope this helps you to decide which upgrade to choose.