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late 2006 white macbook2.1 No: MA700LL/A Model No: A1181 (EMC 2121), upgraded from stock 1 gb memory to 2 gb with amazon/crucial. worked great. few months later, upgraded to 4 gb (undocumented support for 3-4 gb, see http://www.everymac.com/systems/apple/ma... ) using "bargain" komputerbay sticks (2gbX2). system crashed repeatedly. removed and returned system to 2 gb crucial configuration. lost various keys (no delete, space bar, fn, arrow, etc). Several SMC and 1 PRAM resets later and keyboard functionality returns (after ordering new keyboard top!). Upon reestablishing keyboard functionality, I swapped the 2 gb (1gbX2) with 4 gb CRUCIAL (2gbX2) and have 4 gb recognized and smoking performance on boot. Lesson learned: research the vendor (and read reviews).