We have an old Macbook4,1 early 2008. It's a white Macbook with 13.3"/D2.4G/2x1GB/160/SD-DL. The hard drive seems to be crashed. Unlike my primary machines I can't seem to find a TimeMachine nor a cloned hard drive. Of course I have no idea where the original OS DVDs are either. When I try to boot I get a blank gray/white screen. If I plug in a USB drive and hold Option I can see the drive name but I don't seem to have a drive with a compatible OS X so I haven't been able to get it to boot off any. The drives I have are cloned from a newer Macbook Pro Retina. I'm trying to just find some way to boot it off an external drive or thumb so I can run Disk Utility. I've been googling trying to figure out which OS X versions I can run on this. I tried booting it off of some cloned drives I have of a MBP but no luck. I'm willing to buy OS X if I have to but I'm wondering if there is a free version of OS X that I can run on this old machine? I see stuff about people running Mavericks on older Macbooks but I'm not clear if this specific model will work. My ultimate goal is to somehow repair this machine. First step is get it booted to see that the machine itself still works. Step two is to try to run disk utility on the internal HD. Step 3 repair or replace internal HD. I know, I know, we should have had a backup or boot disk or something! And I do for my primary machines. But I don't seem to have a backup for this old machine. Any help appreciated. Would love to be able to diagnose the problem without buying an old copy of OS X.