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1 The display output has been set to the SVGA external port on the back of the laptop. There should be a function key on the keyboard to switch the video output.
2 The device driver for the display got clobbered or changed to a non compatible device. Turn on the laptop, start pressing F8 again and again and again until the DOS boot screen is displayed. Select safe mode and login with your username. The display will be distorted but readable. Select control panel, device manager, and display adapter. Click on the adapter, select the driver tab, and update driver. Do some research and find the latest and greatest driver for the video chip.
If you have a VGA monitor, plug it into the VGA port and see if the video switches to the external monitor when you login.
Instead of using the driver scanner you should go to the manual driver search which is right before that. From there you can manually find your driver and it will not ask you to purchase anything. Another option is to go to the Acer website and get your drivers from there. You will just have to enter the model of your system. On Acer's support site you can download all the drivers for your system.
Open the User Accounts Control Panel and check whether non-administrative users are allowed to use detachable drives.
Open the System Control Panel, click the Hardware tab, then click the Device Manager button. If you see your optical device (i. e., CD-ROM, DVD-ROM) listed with a yellow warning icon or red X on it, there is a problem with the driver program for the drive. In that case, right-click on the problem device and select Properties from the pop-up menu. Follow the buttons for replacing the driver. (The system uses generic drivers before log-in, but device-specific drivers are loaded afterwards).
If you go to the canon website and type in the details of your printed you can probably download the driver there and then install printer and it should find the driver if it dont go to add new hardware and direct it to where you saved the download cannon driver
try going into safe mode,usualy by pressing f8 after restarting it,then select safe mode and see if it boots.If it does boot then you most likely have a driver,virus or maleware problem.There is always the system restore option too from safe mode.