Touch screen not working
The touchpad on the Acer Aspire is built into the notebook itself, which makes the device much harder to troubleshoot or replace. While you can connect a universal serial bus mouse to the notebook if the touchpad becomes unresponsive, attaching any external device reduces the notebook's portability. Although hardware failure can cause the touchpad to stop working, most device-related problems are due to software settings or other conflicts.
Peripheral devices connected to the Aspire can interfere with the integrated touchpad. Disconnect all of the external devices, except for the power adapter, that are connected to the Aspire; then restart the computer. Test the touchpad after booting into Windows. If the touchpad responds, a hardware device is interfering with the pointing device. Reconnect each device one by one to the notebook, testing the touchpad throughout. If the pointing device stops responding after connecting a particular device, the component is interfering with the touchpad. Go to the device manufacturer's website and look up the product model. Check the bulletin board to see if the manufacturer has posted a notice or update addressing issues with device conflicts. If no such update is available, download the latest driver for the component and install it on the computer. b> Disabled Touchpad b> The Acer Aspire 5516 comes with a preset group of keyboard combinations, called hotkeys, that are used to enable or disable devices, configure sound volume and screen brightness, and control the notebook mode. The hotkeys "Fn" and "F7" turn the touchpad on and off. If the integrated mouse is unresponsive, hold down "Fn" and press "F7"; then test the touchpad to see if the device reactivates. If the touchpad still doesn't work, open Device Manager from within the Control Panel. Expand "Mice and Other Pointing Devices," then right-click the touchpad device. If the touchpad is disabled in Device Manager, you'll see the "Enable" option in the context menu. Click it to turn the touchpad back on; then restart the computer. Corrupt Driver b> Windows Vista talks to the touchpad through a program called a device driver. The driver enables Windows Vista to "see" the touchpad and send it instructions. Once the driver communicates these instructions to the touchpad, the touchpad informs the processor that it needs to perform a task, and a specific set of code is performed. If the driver for the touchpad is outdated or corrupt, or if the driver isn't compatible with the OS -- Acer offers touchpad drivers for Windows XP and Windows 7, but these drivers won't work with Windows Vista -- the touchpad becomes unresponsive. Expand the "Mouse and Other Pointing Devices" section from within Device Manager; if Windows detects a problem with the driver, it places a yellow exclamation point or red "X" next to the device. Double-click the touchpad driver to see the error message; then look up the message on the Microsoft Support website for further assistance. b> Touchpad Settings b> Mouse Properties, accessed through the Control Panel, contains several different configuration settings that can alter how the touchpad behaves on the Aspire 5516. On the "Device Settings" tab is the option "Disable Internal Pointing Device When External USB Pointing Device Is Attached." As the option states, if an external mouse is connected to the Aspire 5516, the touchpad will stop working; disable this option if you're using an external pointing device. Clicking the "Settings" button opens the "Properties for Synaptics Touchpad" window. On this screen are the "PalmCheck" and "Touch Sensitivity" options. If PalmCheck is set too high, or Touch Sensitivity too low, the touchpad won't respond to normal touch, making the device seem unresponsive. Hope this helps.