Hi all, I have a Lenovo Thinkpad x220 laptop. BIOS version 1.28 With the installed ram (Samsung 4GB 2Rx8 PC3-10600S-09-11-F3) it works like a charm. I tried an upgrade and bought Samsung 2x 8GB 2Rx8 PC3-12800S-11-11-F3 and installed them, but know the laptop doesn't boot, it makes beeps (one short b...