Hi there, Looking for advice on RAM for the UMPB 15. I bought it with the stock 2 GB and bought 4 GB of OCZ RAM (2 x 2GB), intending to replace the stock RAM with the new ones. Computer will not boot with the new memory in it. However, if I put only one of the new sticks in and keep one of the old ones (for 3 GB total), it usually boots and runs pretty fine for the most part, but with occasional lockups and other weirdness (about once a day). It doesn't matter which of the new sticks I put in or which of the old ones I keep in; the behaviour is the same. Computer is perfectly stable with only the stock 2 GB. Is the new RAM flaky or is it a problem with the UMBP? I read that they are sometimes quirky with new memory but am not seeing much followup on that in the various forums. Not sure whether to try a different brand of RAM or wait for an Apple fix...?