Mac switched on but no output on screen a week after having coloured vertical lines displayed.
Have got a iMac 27", issue with it is that when switching the iMac on I can hear the DVD drive and power start but there's no output to the screen whats so ever but I can hear the iMac is still powered up and running.
Around a week before this issue has happened I has vertical coloured lines displayed on the iMac which I had to hold the power button in to force the power off.
Any ideas I would be most grateful to hear..!
Many thanks.
Around a week before this issue has happened I has vertical coloured lines displayed on the iMac which I had to hold the power button in to force the power off.
Any ideas I would be most grateful to hear..!
Many thanks.
Here are some things to try while you wait for your appointment.
Reset the SMC first to see if you have a response.
If you still get no video, check to see if there's an image by shining a flashlight on the screen. If there is an image, then the backlight has failed. If there is no image, then it may be the video card.
If you have another Mac, you can put this mac in Target IDisk Mode, by holding T while you boot. Attach this mac to another Mac with a firewire cable. Can you see the disk.
If you have a working Macbook (Pro) you can try to set the iMac into Target display mode, by holding Command F12. Attach a monitor cable to the iMac. Does the other Mac detect the display. If it does, then the graphics chip on the iMac may be broken, but the display is not.
Reset the SMC first to see if you have a response.
Unplug the power.
Then press and hold the power button for a few seconds.
Release.
Plug the power back.
Turn it on.
Then press and hold the power button for a few seconds.
Release.
Plug the power back.
Turn it on.
If you still get no video, check to see if there's an image by shining a flashlight on the screen. If there is an image, then the backlight has failed. If there is no image, then it may be the video card.
If you have another Mac, you can put this mac in Target IDisk Mode, by holding T while you boot. Attach this mac to another Mac with a firewire cable. Can you see the disk.
If you have a working Macbook (Pro) you can try to set the iMac into Target display mode, by holding Command F12. Attach a monitor cable to the iMac. Does the other Mac detect the display. If it does, then the graphics chip on the iMac may be broken, but the display is not.
If there were vertical color lines, most likely a fault with the graphics chip.
It could also be the monitor, but that is not likely given the colored lines you say you saw. A lot of people use the "flashlight" trick by shining a bright light into the monitor and seeing if you can see anything visible on the screen, which would indicate a backlight problem.
But I have to go with David, probably time for a new Mac.
It could also be the monitor, but that is not likely given the colored lines you say you saw. A lot of people use the "flashlight" trick by shining a bright light into the monitor and seeing if you can see anything visible on the screen, which would indicate a backlight problem.
But I have to go with David, probably time for a new Mac.
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If it's an old iMac - time for a new iMac.
Tip: If you have an embedded DVD drive, this is an old iMac. Apple no longer ships any machines with DVD drives as they produce massive heat + tend to be the primary reason machines die. Same with mechanical drives, so be sure to get a pure SSD for any new computer purchases... to maximize life of machines.
Tip: If you select to acquire + pay on a Barclay credit card at checkout time (when purchasing from Apple site), then you'll be provided 18 months of interest free payments for your purchases.
Tip: If you require another new Mac down the road in a few years, call Barclay + if you ask, they'll restart the 18 month no-interest payments at any time... for any Mac purchase...