πŸ”₯ SOLVED: iMac won't boot after RAM upgrade - iMac 27" - iFixit

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Ensure you have seated all RAM sticks properly in their slot, verified the keying matches and visually inspected the metal contacts between the.


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imac won 39; t boot after ram upgrade

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MAC (media access control) addresses, MAC (multiple and accumulate), MCR (memory command register), MDR (memory data register), 8 Masked, 95 Mathematics Binary addition, 37–39(t) Binary division, 42–​46 for Ga algorithm with cache enabled, (f) Benchmarks (relative cycles per.


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imac won 39; t boot after ram upgrade

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About This Mac will immediately show if all the RAM is recognized and at the correct speed. If you can boot with the USB key then the path to solving your problem.


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imac won 39; t boot after ram upgrade

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See portable Mac, PowerBook. 27 LCD monitor, – leaks memory, ​— security, – Level 1/2 RAM cache, contextual menus, – contrasted with Mac OS X, 17 and General Controls control panel, – control panels won't work, – installation glitches, – long startup time.


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imac won 39; t boot after ram upgrade

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Thread: Mac Won't Boot After Installing RAM Rep Power: 39 This will identify if the issue relates to your new memory or is just coincidental.


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imac won 39; t boot after ram upgrade

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MAC (media access control) addresses, MAC (multiple and accumulate), MCR (memory command register), MDR (memory data register), 8 Masked, 95 Mathematics Binary addition, 37–39(t) Binary division, 42–​46 for Ga algorithm with cache enabled, (f) Benchmarks (relative cycles per.


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imac won 39; t boot after ram upgrade

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imac won 39; t boot after ram upgrade

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Ensure you have seated all RAM sticks properly in their slot, verified the keying matches and visually inspected the metal contacts between the.


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imac won 39; t boot after ram upgrade

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About This Mac will immediately show if all the RAM is recognized and at the correct speed. If you can boot with the USB key then the path to solving your problem.


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imac won 39; t boot after ram upgrade

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imac won 39; t boot after ram upgrade

It can take considerable pressure to get them to "click" into place fully. I didn't wait 30 sec to see if it would boot. As long as I install ram in pairs, it runs like a charm. RAM must be installed in matched pairs. Reading through several of them, the people with issues say their iMacs act strangely, including random shutdowns. You can hear and feel them snap in. So other posts I've read where people's systems need 30 sec or so to verify new ram before booting up, is true. And all ram shows up correctly. Memory install However, there were problems when it was close to or max capacity of a mix or only third party RAM. Still no luck. Conflicting info. I've tested the new ones on their own in the iMac, and the system boots up fine. I'm going to try the 30 sec wait and see what happens. Ask a question. Sign in Sign in Sign in corporate. Jan 9, PM in response to babowa In response to babowa. Not even the chime. View answer in context. Also, I've read a couple of people had to wait 30 seconds for the chime when they installed new ram in their iMacs. And there are different thoughts about Matched Pairs. Installed the original 2 modules back with the new ones. Jan 9, AM. I'm wondering if slot 2 and 4 are maybe damaged? Except they are 8GB modules instead of 4GB. This way you avoid fooling around for a couple a days trying to figure out why your machine won't boot up. Posted on Jan 9, AM. Which means even with their issues, their iMacs still boot up. More Less. I use Mushkins in my Mac Pro, and they work just fine. I'll give that a go when I get home from work. Well, I don't have a brand new iMac, so I can't say if what Apple said is correct except that I have seen threads here with people mixing different size RAM successfully; however, my first question would be:. But when I put all 4 together, the iMac doesn't boot up. Communities Contact Support. Is there a fix? It's only when all 4 are used at the same time, that the iMac doesn't start. The iMac is a new purchase. If that doesn't work, I'm going to get another set of the Mushkins, so that all modules are exactly the same brand, size and specs. Posted on Jan 9, PM. I thought maybe the timing was off between the two sets. I'm setting it up for her. User profile for user: Kappy Kappy. I made sure they were all securely placed. I haven't tried using just slot 2 and 4. User profile for user: Eric Shawn2 Eric Shawn2.

To start the conversation again, simply ask a new question. Page content loaded. I just got off the phone with Apple, and they are saying all modules have to be the same size. Reply Helpful Thread reply - more options Link to this Post. Mine doesn't at all with all 4 modules installed.

But click here sets are CL So timing shouldn't be an issue either.

For some reason, my iMac late 3. Jan 9, AM in response to babowa In response to babowa. Answer: A: Answer: A: Success! Hey Boomer, I went through all info yesterday. Giving to my sister.

I've spoken to a couple of IT guys at work about the 30 sec comments I've read. Which is strange, because I've never heard of this. Thanks to all for their input.

Not even a chime, or warning chimes. Same goes with just using the original ram.

All modules need to have the same specs, and imac won 39; t boot after ram upgrade must match the requirements for just click for source model. My Mac Pro has different speed ram modules, with different sizes in it. I've even heard the new iMacs imac won 39; t boot after ram upgrade have to have ram installed in pairs.

User profile for user: babowa babowa. Question: Q: iMac won't boot after ram upgrade More Less.

I didn't try waiting that long after hitting the power button. Jan 9, PM.

To my understanding, you have to use 1 and 3 first. Same specs as the original modules that came with the iMac. They said, sometimes, systems takes a little longer to start up when new ram is added. New ram is exact same specs as original that came with the iMac. Same size in the two upper slots and the same size in the lower slots.

Desktops Speciality level out of ten: 1. Apparently because it does a diagnostics before it actual starts to boot. And after wasting your time you go get top of the line Ram and your problem goes away like magic.

Since you said that it works with either installed, I'm wondering if it's either a brand or a size mixture issue. Including the install instructions in About this Mac, just to make sure I wasn't missing anything.

When I installed all modules, they all snapped into place. Can't mix and match sizes. Loading page content. All replies Drop Down menu.

I still have my Mac Pro. You must also imac won 39; t boot after ram upgrade sure the modules are seated fully. Thanks for the link babowa. Can anyone confirm this? No error. Browse Search. Will post back with results. I said I was going way out on a limb but I did see some threads here Hope getting four of the same works for you - personally, I would have ordered new ones from OWC or Crucial and returned the Mushkins Not to step on anyones toes here but I was always told to buy Top of the Line Ram.

Both are confirmed to have the same specs. Jan see more, AM in response to babowa In response to babowa Thank you, babowa.

Hit the power button and waited about 30 sec. Never heard of any Mac taking 30 sec to just chime in. As I mentioned, each set used by themselves, the iMac boots with no issues. However, the size in the upper two slots and lower two slots need not be the same.