This machine had a faulty HD4670 MXM graphics card, cured by reflowing and has run for 18 months. Now it will start and run normally provided the NVRAM reset keys are held until it does - sometimes a couple, sometimes 20 or more chimes needed. It then operates entirely correctly. Normal video and all devices.
If allowed to sleep, it may need the same treatment. NVRAM battery is 2.9V. Date and time are stored. High Sierra even files a 'fail to wake from sleep' report.
Based on the above, and assuming a bad cap somewhere, any previous experience? The SMC is the obvious area.
A working iMac is still useful, but intermittent is frustrating.https://www.badcaps.net/forum/images/icons/icon8.gif
If allowed to sleep, it may need the same treatment. NVRAM battery is 2.9V. Date and time are stored. High Sierra even files a 'fail to wake from sleep' report.
Based on the above, and assuming a bad cap somewhere, any previous experience? The SMC is the obvious area.
A working iMac is still useful, but intermittent is frustrating.https://www.badcaps.net/forum/images/icons/icon8.gif
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