Since the short diagnostic usually only needs to two minutes (maybe 5 - 10 minutes if the drive is being used heavily), this could actually indicate a hardware issue either with the drive, the hard drive SATA cable, or possibly some other issue with the laptop itself. Many times I find that software issues will cause this problem because it keeps the drive too busy in order to successfully complete the selftest. I don't see anything in the DriveDx report although the short self-diagnostic never finished which is unusual. I forgot to suggest to run Disk Utility First Aid on the drive and to run "Repair Permissions" as well (I think the "Repair Permissions" may still be available in macOS 10.11, but if not then run it from Yosemite). By erasing the whole drive (possibly re-partitioning it) you eliminate the file system issues unless it is caused by a hardware issue. However, if there is a problem with the file system it may be interfering with the 10.11 install process. If Snow Leopard and Yosemite are booting and working fine, then it should be possible to install macOS 10.11 as well without erasing the drive. Would anyone be able to suggest what it is that I am doing wrong please? I therefore downloaded Yosemite which is fine as it lets me open it but after I select the disk where I want to install it, I press “install” and after the process ends nothing happens, I turn the computer off and on and also nothing happens. This is why I tried to install directly El Capitan which I downloaded from the Apple support page but, as soon as I try to open it, a window appears saying that the OS is not supported. The same happens if I try using the Snow Leopard OS install disk. I have started by trying to re-format to original factory settings by using the dvds which came with the laptop (please see photos) but when I try to boot from DVD by pressing C after turning the laptop on with the disk already in, I can hear the disk running but within a few seconds the disk gets ejected. I am seeking help as, Ideally, I would like to format my MacBook Pro 7,1 (mid 2010) and update the OS from 10.6.8 to El Capitan.
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