How much free space do you have on your boot drive. Select the drive on the Desktop and type Command+i to bring up its Info window:
If you're down to less than 1-2 GB you're in serious trouble. If that's the case you should immediatedly move or delete files off of your hard drive until you get a minimum of 10GB of free space. That's what's needed for reliable performance of the system and applications. If you don't you might get to a point where your MBP locks up, crashes and won't be able to reboot due to insufficient space for swap and cache files
Don't to anything else until we find out how much free space there is.
My iphotos are gone?
It started with a box Your Start up disk is almost full!
Mac OS Start up disk has no more space.!
Then photos in iphoto have disappeared!
If you are out of disk space (and we need to verify since rarely this can be a false error message) then your photos may be gone from your Mac and only on your source (camera) or backup
Exactly how large is your hard drive and how much free space do you have on it?
Been into master folder tried dragging into a iphoto sas NO "change libaries",
! - it is a really bad idea to go into the Masters folder and if you drag things around in it you will destroy your library - do not ever make changes to the content of the iPhoto library without specific instructions from a very experianced iPhoto expert
2 - "dragging into a iphoto sas NO "change libaries"," - please explain as this makes no sense at all
Changed to Apperature libaries and still won't work???
OK what happens when you try to open the library with Aperature?
I have done backup on external harddrive, but that has only put it into year order, not all the sub folder titles that I had them in.
What exactly does this mean? What backup software are you using? Are you backing up the iPhoto library intact or only photos from it?
Waht version of iPhoto and of the OS
We can only help if you provide details and if you answer specific questions so we can understand what you have and what is going on
Best bet is to pruchase an external hard drive immediatelhy and move you iPhoto library and iTunes library to it - for iPhoto
Moving the iPhoto library is safe and simple - quit iPhoto and drag the iPhoto library intact as a single entity to the external drive - depress the option key and launch iPhoto using the "select library" option to point to the new location on the external drive - fully test it and then trash the old library on the internal drive (test one more time prior to emptying the trash)
And be sure that the External drive is formatted Mac OS extended (journaled) (iPhoto does not work with drives with other formats) and that it is always available prior to launching iPhoto
And backup soon and often - having your iPhoto library on an external drive is not a backup and if you are using Time Machine you need to check and be sure that TM is backing up your external drive