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Apple Computing Products:
macOS - Desktop Hardware
Vertical striped screen - no boot
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<blockquote data-quote="Ancestor" data-source="post: 1778153" data-attributes="member: 397020"><p>Thanks Patrick, but things have now moved on! An hour ago I thought I would have one last try; switched on the computer and it sprang to life with everything normal and in place. Now it's even more worrying because I am not sure what caused the symptoms which certainly indicated a GPU failure. Now that I have access to Apple Prefs I can tell you that the GPU is an ATI Radeon HD 5750. The computer was from early 2011, so it was not in the Apple recall that identified the batch of faulty cards. </p><p>Now as to reasons - while I was struggling with the shock of finding the screen a mass of vertical lines, I noticed that the "ADSL Sync" light on my modem was red. Then all the other modem lights went to red,began flashing and the modem re-booted itself. I theorise that some interruption overnight - to the power supply or the internet service (or both) confused the computer which would have been woken from Sleep mode. It's connected to an APC battery backup and standby unit, but that battery has not been drained (still green light) so whatever the interruption was, it must have been temporary.</p><p>This is the first glitch in six years of running, so it may be worthwhile having it checked professionally. Could a Mac technician test the GPU without replacing it? Meanwhile I'm planning to switch the computer off at night, not Sleep it, and I had better start upgrading the OS and software. If I have a major crash it would be easier to port files to a similar new computer than from one with the OS out of date. Agree? Again, my appreciation for your help.</p></blockquote><p></p>
[QUOTE="Ancestor, post: 1778153, member: 397020"] Thanks Patrick, but things have now moved on! An hour ago I thought I would have one last try; switched on the computer and it sprang to life with everything normal and in place. Now it's even more worrying because I am not sure what caused the symptoms which certainly indicated a GPU failure. Now that I have access to Apple Prefs I can tell you that the GPU is an ATI Radeon HD 5750. The computer was from early 2011, so it was not in the Apple recall that identified the batch of faulty cards. Now as to reasons - while I was struggling with the shock of finding the screen a mass of vertical lines, I noticed that the "ADSL Sync" light on my modem was red. Then all the other modem lights went to red,began flashing and the modem re-booted itself. I theorise that some interruption overnight - to the power supply or the internet service (or both) confused the computer which would have been woken from Sleep mode. It's connected to an APC battery backup and standby unit, but that battery has not been drained (still green light) so whatever the interruption was, it must have been temporary. This is the first glitch in six years of running, so it may be worthwhile having it checked professionally. Could a Mac technician test the GPU without replacing it? Meanwhile I'm planning to switch the computer off at night, not Sleep it, and I had better start upgrading the OS and software. If I have a major crash it would be easier to port files to a similar new computer than from one with the OS out of date. Agree? Again, my appreciation for your help. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Vertical striped screen - no boot
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