Added new ram, now wont post

January 16, 2010 at 14:18:45
Specs: Windows 7 64bit
My MOBO has 4 memory slots, the first two have 2gb each (with no problems). I went to add another 2gb in each of the other two slots, but then it wont post anymore, nothing, nada. My BIOs are updated. What are my options to fix this problem? My ram is 800, not the 1066.

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#1
January 16, 2010 at 14:21:41
Post the model and make of the mobo and make and specs of the ram.

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#2
January 16, 2010 at 14:28:23
Asus / M4a78 plus is my mobo. The slot one ram is OCZ SLI-Ready Edition 240-Pin DDR2 SDRAM 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2N800SR4GK
The new is no brand pc2-6400 ddr2 800 mhz 091231 (ebay). The new ram works in the first slots, but anything in the 2nd is not having anything post...

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#3
January 16, 2010 at 15:03:18
Consult your motherboard for proper RAM module placement. You should NOT use two different brand/model RAM modules.

For best results you should use RAM that is one the QVL for your board.

There is a good chance the different RAM modules may have different voltage requirements. That in itself will probably cause problems. At any rate all the specs are most likely different enough to cause problems.

A link to the Asustek site for your motherboard is below. Look at the QVL (Qualified Vendor List) to see if any of your RAM is on there.

Why are you buying RAM off eBay? There are many good online vendors to choose from.

All RAM is NOT created equal. Even RAM that appears to be the same, may not be.

http://support.asus.com/download/do...


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#4
January 16, 2010 at 15:24:40
If I plug the new ram in would I be able to find what the voltage recquirements are? What's the difference between low and high density? Here's the ebay stuff http://cgi.ebay.com/4GB-2X2GB-PC2-6...

Any other possible reasons?

The OCZ ram I bought with the baord from newegg as a combo.


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#5
January 16, 2010 at 15:46:59
Ohhh. Answered my low/high question. I spose I make a mistake with the high density stuff? Still time to return it.

Anywho, if I put one stick per channel and it still wont do anything, could that lean towards the 2nd channel being bad? Or could there be other explanations for that?


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#6
January 16, 2010 at 16:36:26
"if I put one stick per channel and it still wont do anything, could that lean towards the 2nd channel being bad?"

Your board has 4 DIMM slots that are labeled A1 & B1 (yellow), A2 & B2 (black). What that means is one yellow slot is channel A, the other yellow is channel B. Same goes for the black slots...one slot is channel A & the other is channel B. To enable dual channel mode with just 2 sticks, you need to use either both yellow slots or both black slots. Assuming that's how you originally had your OCZ RAM installed, there's nothing wrong with the 2nd channel. Try the OCZ RAM in both black slots & see what happens.

"Answered my low/high question. I spose I make a mistake with the high density stuff?"

Have you read the chapter on memory in your motherboard manual? Your board "does NOT support DIMMs made up of 256 megabit (Mb) chips or less". I believe that means your board supports high density RAM only.


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