![]() However if your iMac falls into this category and Apple will not help you out with their hidden extended warranties then this might be your only option if you feel adventuresome. I have used this method on some Macs and PCs over the years and though it does initially work there is the chance that at some point the card will fail again. Some folks have reported success with reheating the pins on the failed card using a mini butane torch. You could try reinstalling your operating system though it's also possible that your Mac has succumbed to a known failure issue which is a bad video card. If not it may be something a bit more involved. This is done by dragging the bar from the external display (2) to the primary display (1). If you do see your desktop on the external monitor, go to System Preferences -> Displays and check to make sure that your primary monitor is selected. Typically though if the HD is bad or the OS is corrupted you will get an error on screen. ![]() I recommend using Carbon Copy Cloner available here, for this task if you build USB key. If you did not get a working display on the external monitor you could try running an install DVD if you iMac came with one or if you can get a hold of a working iMac of the same generation you could try building a USB boot key by cloning the known good OS onto the USB key and booting your Mac with it. If yes it might be an idea to backup or copy off any files and data that you might want should things go bad further on down the line. If not and you have an external monitor handy and the Apple external monitor adaptor try plugging it in and see if you now have a desktop. White screen can be a number of things so before you tear down your iMac which is a real PITA to do you should determine if it is something simple. To reset the parameter ram on a Mac you hold down cmd+opt+p+r and not control it has been this four finger salute since the compact Macs. Really late to the party but I'd like to point out somethings.
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