Windows 7 failing to boot after RAM upgrade

Hi all,
I don't think I'm being dense here, have looked through the forums and not found a similar problem! So I'm now worried there's something wrong with my iMac (21.5" late 2009 dual core Radeon 4670 1TB) - so thanks in advance for your thoughts...
All was well with OS X and Win7 on bootcamp until I decided to add an additional 8GB of RAM which I bought to be compatible and installed myself. Weirdly, although the manual says my existing 2 cards should be in the two slots closest to the screen, they were in the rear two, but there you... Perfect with OS X, system monitor saw them both and the system sped up nicely. But launching Windows hung on the blank screen before even getting to the starting windows logo. I thought my new RAM must be mismatched somehow, so I removed the original 2 x 2gb modules and restarted, but the same thing happened. Just for my own amusement, I then tried putting the two new cards in the rear slots as the originals were, (officially the Wrong place) and miraculously it worked! So although I now have 8 instead of 12 GB of RAM, it seems fine and I can see an improvement in both environments; so assumed the initial problem was due to mismatched cards.
So now, since my new memory was cheap, I decided to get two mote to match and go to 16GB, but lo and behold, I'm getting the problem again. It seems like having cards on my two front memory slots is causing the problem.
Has anyone experienced anything similar? Should I be looking for a repair from Apple?
Thanks guys for your thoughts or suggestions...

I am struggling with a very similar issue. Did you figure anything out?

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1. Resetting the PRAM, no luck.
2. Holding option at start-up, shows no icon.
3. Holding shift, no luck.
4. Holding X, nothing.
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Welcome to Apple Discussions!
You clearly have a problem, but you don't describe exactly what that is other than that your mini won't boot after the upgrade. What happens when it starts up? Does it attempt to start and hang up on the grey or blue screens, or does it start beeping at you almost immediately after you try and start it up, and also flash the power light?
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I'm sorry if the case has been already posted.
Yesterday I took my MacBook Alu unibody late 2008 to a RAM upgrade (from 2 to 4gigs) to an offical Mac Reseller. They installed it and showed me that the system loads properly and recognized the new RAM.
I took it home, started working on After Effects and Photoshop and when i wanted to check a video on Quicktime, this program refused to boot.
Then photoshop freeze and after effects did so. I quited all aplications and restarted. On restart after the 'bong' i've got the grey screen white an apple logo and a loading bar underneath, that was it, it never finished loading but shutting down.
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So basically the want 80euros to check what's wrong with my computer plus the 120 i already payed them for a RAM that doesn't work and of course the repair cost of the computer.
On monday i'll go to talk to the boss, what do you guys recomend me to tell him? i'm frustrated that the guys there treat me like if i broke my computer for beeing stupid and wanted to get it fixed for free, when it clearly broke after they did something wrong on it!
please advice me!
thanks!
Message was edited by: finn bell

What brand is the RAM? From what you said, it is obvious that the RAM is at fault. I would simply tell them that it is not compatible and return the RAM.
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Hello
For me it sounds like that the modules are not compatible or have defective sectors
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Enkay1

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Laptop won't boot after RAM upgrade

Hello guys,
I've just upgraded my RAM from 4gb to 8gb.
I know I can do it since the manual from my notebook says so. After installing the new RAM my laptop only shows blank screen. I upgraded my ram with Corsair CMSO8GX3M2A1333C9. How do I solve this problem? Thanks for the help!
Cheers
Edit : Clumsy me, It hadn't clicked properly now it run smoothly
Solved

I took a look at the memory finder on the Corsair website. Corsair does not appear to produce any modules that they guarantee are compatible twith your notebook. You may end up having to return the modules. Contact Corsair support via the Corsair forum to see if they know which modules will work with your notebook.
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For a successful memory upgrade, alwaays add memory modules in identical pairs of guaranteed compatible memory modules.
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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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Are you running Windows 7 - 64bit?
HP Pavilion G4 Notebook PC Maintenance and Service Guide
From the Service and Maintenance Guide:
Supports the following configurations:
● 8192-MB total system memory (4096×2; not
supported with Windows® 7 32-bit
operating system)
● 6144-MB total system memory (4096×1 +
2048×1)
● 4096-MB total system memory (4096×1 or
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● 3072-MB total system memory (2048×1 +
1024×1)
● 2048-MB total system memory (2048×1 or
1024×2)
● 1024-MB total system memory (1024×1; not
supported with Windows 7 64- or 32-bit
operating system)
Here is a reference Guide you can look over to see if you missed anything.
There is a Troubleshooting section you can check that may help resolve any temporary issues.
Upgrading Memory (RAM)
Kind Regards,
Dragon-Fur

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Hi Admicoker1,
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Best Regards.
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IMac won't boot after ram upgrade

For some reason, my iMac late 2013 3.4Ghz quad core i5 won't boot with new ram modules added. New ram is exact same specs as original that came with the iMac. I've tested the new ones on their own in the iMac, and the system boots up fine. Same goes with just using the original ram. But when I put all 4 together, the iMac doesn't boot up. Not even the chime.
Combinations I've tried are:
1-Old
2-New
3-Old
4-New
No boot
1-New
2-Old
3-New
4-Old
No boot
1-New
2-Old
3-New
4-empty
No boot
1-Old
2-New
3-Old
4-empty
No boot
1-New
2-Old
3-Old
4-New
No boot
1-Old
2-New
3-New
4-Old
No boot
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1-New
2-empty
3-New
4-empty
Boot good
1-Old
2-empty
3-Old
4-empty
Boot good
I just got off the phone with Apple, and they are saying all modules have to be the same size. ie. all 4GB or all 8GB. Can't mix and match sizes. Which is strange, because I've never heard of this. My Mac Pro has different speed ram modules, with different sizes in it. As long as I install ram in pairs, it runs like a charm. I've even heard the new iMacs don't have to have ram installed in pairs.
I'm wondering if slot 2 and 4 are maybe damaged? I haven't tried using just slot 2 and 4. To my understanding, you have to use 1 and 3 first. Can anyone confirm this?
Also, I've read a couple of people had to wait 30 seconds for the chime when they installed new ram in their iMacs. I didn't wait 30 sec to see if it would boot. Never heard of any Mac taking 30 sec to just chime in. lol Has anyone else experienced this? Is there a fix? Tx.

CLICKY CLICK---> iMac: How to remove or install memory
Or
Apple>About This Mac>More Info>Memory: Double click "Memory Install Instructions" at the bottom right of window.
my iMac late 2013 3.4Ghz quad core i5
Conflicting info. Your system profile shows: Mac Pro, Mac OS X (10.6.8). Please update/correct.

HP 311 won't boot after ram upgrade

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My ram

Are you running Windows 7 - 64bit?
HP Pavilion G4 Notebook PC Maintenance and Service Guide
From the Service and Maintenance Guide:
Supports the following configurations:
● 8192-MB total system memory (4096×2; not
supported with Windows® 7 32-bit
operating system)
● 6144-MB total system memory (4096×1 +
2048×1)
● 4096-MB total system memory (4096×1 or
2048×2)
● 3072-MB total system memory (2048×1 +
1024×1)
● 2048-MB total system memory (2048×1 or
1024×2)
● 1024-MB total system memory (1024×1; not
supported with Windows 7 64- or 32-bit
operating system)
Here is a reference Guide you can look over to see if you missed anything.
There is a Troubleshooting section you can check that may help resolve any temporary issues.
Upgrading Memory (RAM)
Kind Regards,
Dragon-Fur

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