hi just a quick story about 6 months ago my Core Duo MBP shut off and then rebooted with loud post beeps. everything is fine since except that it can only run with 1 stick of RAM in the lower slot, with both or just the upper filled it doesnt boot and the optical drive sounds like it cant start. does anyone know what the problem is and could i fix it myself? my 1 year warranty is out and missed the 2 year upgrade. also does anyone know if this model can run 1x 2GB of memory? i used to have 1.5GB (came with 1x 512MB and added 1GB) and now been running with just 1 gig and missing the performance albeit a positive is Snow Leopard is a lot more snappy on 1 gig than Leopard .