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
The only combinations that work are:
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.

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Quote from: NexumxRaptoR on 07-November-13, 23:58:36
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