2 MacBooks are suffering from 2 independent problem. One can not update and that is due to the fact that it is an early 2009 A1297 That is not compatible with Mac OSX 10.12.6... It is unfortunate that apple does not allow a different path of upgrade for this. The other book had the dreaded 3 beeping noises. And after diagnostics we realized that this is a memory slot issue. where the bottom one is not having correct connectivity to the memory chip.