Has anyone had issues upgrading RAM?

I have a mid 2010 Macbook Pro 13" It has had its operating system updated around 3 months ago.
Today I tried putting 2 kingston 4GB RAM cards in and it refused to accept them. It would think at start up and then freeze.
The computer shop guy said he has never seen a mac do what mine was doing. We tried an alternative hard drive and several different type of RAM cards.
My mac would only accept the original samsung 1067 mHz 2GB cards.
Its operating at terribly low speeds.
I tried updating firmware but, no firmware updates will work at all and a message says; "software not supported on this system"
Any ideas?
Thanks peeps

I have upgraded RAM in many of my Macs over the years.  There were times (in the past) when I got the cheapest RAM I could find, and would have problems, and need to exchange it.
Lately, I've used Crucial for my RAM needs, and I've been very happy.  OWC (MacSales.com) is also highly respected in Mac related forums both here and elsewhere.
My most recent upgrades were my Macbook Pro to 8GB, and my 27" iMac to 16GB, my Wife's older Macbook Pro to 6GB, my Mac mini to 3GB, before that my white Macbook to 4GB.  All of these have been from Crucial and have worked without any problems.

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