HP Pavillion dv6626us notebook upgraded to Windows 7 from Vista. The original memory was bad so I put in 2 - 1Gb memory stick to equal 2Gb but would only work with one (1Gb)stick. Then replaced that with 2 - 2Gb memory sticks and the result was no display and no boot. Removed one memory stick leaving 2Gb in place and it works fine. The goal here is to get 4 Gb working. Please point me in the right direction.
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