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Not sure which Sony you have. Does it have the old touch button in the center of the keyboard? I used to get many Old Dell 600 series and the problem was the touch button in the center was bad. With the customers permission I would cut the ribbon cable to that button and it would be fixed. It seems that a bad touch button would have the pointer wandering and conflict with the touch pad. If you only have a touch pad it will likely be that pad is bad. Change it out would be my suggestion. Good Luck!!!!!
You may need to enable the buttons for Sony Vaio Synaptics TouchPad as follows...
1. At the bottom left of the screen on the Taskbar, left-click on start.
2. On the pop-up window, left-click on Control Panel.
3. In the Control Panel window, left-click on Sony Notebook Setup
4. On the Sony Notebook Setup pop-up, left-click on the Device tab.
5. Left-click on Pointing Devices to high-light it, then left-click the Settings button.
6. On the Mouse Properties pop-up window, left-click on the Device Settings tab.
7. On the Devices listing for Synaptics TouchPad, left-click the Settings button.
8. On the pop-up window Properties for Synaptics TouchPad on PS/2 port....
9. Left-click on Buttons item to bring up a Buttons frame with an Enable buttons check box.
10. If the check box is not checked, left-click on it to enable the buttons for the TouchPad.
11. Left-click Apply button or OK button to enable TouchPad buttons and exit the pop-up window.
This will download the driver for your touch pad then you need to run the driver that you downloaded.
Then restart the notebook
Check whether it is working.
you can find other drivers for Sony Vaio VGN-A790 on the below link.
That must be a hardware problem. Your touch pad need to be replaced with a new one. If your phone still covered with manufacturer warranty, you can have it repair free of charge. But if not, you can bring it to any phone repair shop to fix it.
Hello, if your touch pad is diabled you need to enble it from VAIO Control Center. You need connect a external mouse in order to follow the steps easily: Click Start, All Programs, and VAIO Control Center. From there you need look for Touch Pad > enable it.
I had the same problem . The micro switch needs to be replaced . All push button micro switches have a certain amount of "clicks" before they loose ability to make a good contact . Your left click switch has exceeded its life and can no longer make a clean contact without more pressure . Eventually the spring in the switch will fail thus stick permanantly.You will have to take it to an authorized Sony Service center or maybe an office machine service department might have the replacment . I fixed my own with an old mouse microswitch .Hey it's a Cheap laptop and uses cheap parts.
My Vaio touchpad started behaving strange. I could move the curser, but no response on left or right click or double tap. Also found that in any search field or user name fields, the computer would just type endless 9's. My wireless mouse could operate the left and right click buttons, but not move the curser. A suggestion to get the mousepad operating again was to touch any key on the keyboard. This allowed it to function again. Final solution was to remove the battery, then hold down the start key for about a minute, reinsert the battery and start it up. It seems to have resolved the problem. I have a 3 month only laptop with Windows 7 already installed. Hope this helps.
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