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Snowy display with diagonal lines on my iMacCompleted power supply repair on a late 2012 27” iMac and at same time upgraded to SSD. Got everything sealed up and when...
What causes “snowy” display on iMac screen after replacementCompleted the power supply replacement repair on a late 2012 27” iMac and at same time upgraded to SSD. Got display and...
Answer to "What causes “snowy” display on iMac screen after replacement"Problem solved by cutting back through adhesive and disconnecting/reconnecting display video cable.
Answer to "Apple STUMPED - iMac shuts off randomly, daily to multiple times/hour"I had this exact same problem with my Late 2012 iMac 27" i7. Must be something particularly sensitive with the PSU on these models. Anyhow, I replaced the PSU with a new one ordered from Amazon and so far so good! Upgraded the HDD to a 1TB SSD while I was in there! So what causes these faulty PSUs on the iMac? I had no problems with this iMac until I started taking the unit home from work and plugging it into an outlet that was UNGROUNDED. I suspect that the fluctuations in current, be it sags or spikes, created this problem. I only did this under 10 times, but the damage was done. Word of caution to anyone who has a failing PSU on their iMac.... check to make sure that you are strictly using a grounded outlet (even better if you equip it with a UPS with AVR) once you get your faulty PSU replaced! Update (05/07/2018): I still contend that the random shut downs are due to faulty power supply unit inside iMac. Once these get tweaked by sags or surges in current from your electrical or ungrounded outlet the...