T430 RAM stick Boot Issue

I bought and successfully installed a 4GB RAM stick. It functioned properly until today, when I got it back from a Lenovo authorized repair shop. I had removed and left my 4 GB crucial RAM stick at home before bringing it in for repairs. When I finally brought my T430 home, it wouldnt boot with the RAM stick inserted although it would work in the past. It worked perfectly fine without the 4GB crucial RAM stick. Why is this happening?

Have you updated the BIOS?
Also, is this Crucial ram behaving the same in both of the dimm slots?
What was the problem that forced you to take it to the repair centre?
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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