What hides under the operating system and is invisible Disk Warrior and TechTool Pro?

new background of ignorance

Maggy apprentice gave me his 2010 MacBook Pro (Snow Leopard) for repair, it was incredibly slow, often cold.

I threw my skills to it:

Repair permissions

Disk utility

Target mode: Warrior of the disc; Tool Pro technology

I tried resetting the PRAM and SMC.

In the target, I also cleared its player (after performing a backup) and tried

installation of Snow Leopard disc - it stuck.  Installation at a standstill, again and again.

Problems overall, I could not recovery mode or

safe mode even though I could get the boot drive and target mode.

He certainly felt as if the keyboard was in trouble.

Finally, I copied the backup to disk of my wife, who was also the snow leopard,

on a portable computer freshly erased and voila - it worked.

I could then use to wipe the drive, then download and

install El Capitan.

After 2 failures, followed by repair disk, he succeeded, I could

migrate the original backup again and everything is now up-to-date.

All the software proceeds smoothly, and the keyboard is good,

Some of the above was conducted in partnership with the Apple phone support

and the guy said something that bothers me is why I write

it: -.

He said that none of the diagnostic and repair tools, I used went deep enough

to diagnose or repair the software deep that runs under everything else.

Can I ask here - this looks like PC BIOS?

and if so, is there really all tools that can diagnose and fix problems here?

TIA

Pete

Disk Warrior takes the sophisticated approach for repair of directory (the same function as the line of fsck command, also headed by disk utility repair disk when it is not the system startup).  And although there is some data recovery options on its own, I would like to use a non-invasive data recovery tool before you try.   As a munged really directly still will leave you without access to your data.  Or a dying hard drive that may have similar symptoms as a bad directory.   All the more reason to backup before you do anything either.

http://discussions.Apple.com/docs/doc-1689

TechTool Pro is able to look in depth of the material and tell you if there are hardware issues can be changed or need repair.  Regarding the BIOS, yes the Mac have a BIOS, and they have firmware too.    But any really bad material is only repaired by replacement.  TechTool Pro can tell a lot of cases where it is necessary, with more details than the test integrated hardware Apple.  And in some cases, do a repair like disk Warrior, but it is not infallible.    Since released RAM 128 MB, there is no test equipment that can reliable 100% of the time tell you when the RAM is bad.    However, when it detects as being faulty, you can believe it.

Tags: Mac OS & System Software

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