how start a mac in safe mode

December 22, 2013 at 16:51:58
Specs: Apple 10.7

Problem started with scrreen freesing and going in "negative colours". A few times computer wanted to sent inmformation to apple and then started and ran for a few minutes. Now computer stalls at start-up and repeatedly asks me to shut it down and restart.

See More: how start a mac in safe mode

December 22, 2013 at 18:29:57
I have a couple Macs. But it was suprise to me that there is a "safe mode" for the OS" though logically their might/ought to be one...

So I dun a wee trawl via google for - safe mode Mac OS

And the first hit is this:

Presumably that is what you're looking for?

If it doesn't resolve... possibly a PRAM operation will help? A google for that - using those exact letters as part of the search will bring much about it and what it "may - or may not" achieve.

I used: mac os pram - as the search term.

I'm very interested to know the outcome of this post...

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December 25, 2013 at 11:54:43

I don't seem to be able to find my previous response, but just to update you. The problem has gone from bad to worse. I've repaired to 'permissions' reloaded Mac OS Lion, I think I reset NVRAM and SMC but all to no avail. Problem has now deteriorated to a point where I cannot find a key combination to start-up computer. So posted a new more detailed question today. No apple techs available in my town until the New Year.

Thanks for you help through.

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December 25, 2013 at 12:09:24
hi... mmm... this does sound "not good" to say the least...

Can't see your "new" post... what is it's subject line and so on?

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Related Solutions

December 25, 2013 at 12:16:57
Dun a wee trawl for - key combinations to start Mac OS Mountain Lion - and these are few of the hits... Perhaps they may help.

There is some duplication of course in the three links; but I think there are also one or two differences as well...

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December 26, 2013 at 13:58:44
Hello TVIR:

Well I thought I had a solution. Was able to start laptop in Single User Mode (Command S) and run "/sbin fsck -fy" command that on first attempt stated "File System was Modified" and on second run said the disk was ok. But still no luck with start-up. Next somehow managed to start computer with just holding "s" and got a full start-up. Then when to 'Terminal" and ran sudo commands for Permissions and everything seemed okay except Safari would not open when I was going to paste messages received while running sudo.

Next thing I opened Firefox and the screen started flashing and froze again.

So I'll keep trying a few more of the options you kindly listed.

Thanks, I'll keep you posted.


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December 26, 2013 at 14:39:31
Thank yu for update.. I still haven't heard from my chum at Apple; possibly he's in Italy for Christmas.. so will see if we can connect early in 2014. Would like him to read this series of posts to - if only to get his view and advice...


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December 27, 2013 at 16:45:13

Managed to get it started from installation disk and ran Apple Hardware Test (Extended). No problems identified.

Computer is MacBookPro 4, 1 with Intel duo Core processor. CPU Speed 2.4 gHz on 2.0 gig hard drive. SMC Version 1.27.F3.

I have also re-done NVRAM reset and SMC reset.

Started in Verbose Mode and received the following error messages:

SMC :: smcReadKeyAction ERROR : smc ReadData8 failed for key $Num (ksmcKeyNotFound)

SMC ::smcReadKeyAction ERROR :$NumKeyNotfound(0 x 84) fKeyTable=0x0

Previous Shutdowm cause 3

SMC InitHelper ERROR : NM10 regMap = = NULL - Fall back to old SMC mode

Warning: ACPI_SMC_CntrlLoop : : initCntrlLoop - no sub - config match for MacBook Pro 4, 1 with 8 p-states, using default stepper instead

SMC : smcReadKeyAction ERROR : smcReadKeyData8 failed for MOTP (ksmcKeyNotFound)

NVDANV50HAL loaded and registered

DSMOS has arrived

SMC : smcReadKeyAction ERROR : smcReadKeyData8 failed for key BeMB (kSMCKeyNotFound)

AUTH Result for : 20:aa:4b:73:97:e0 MAC AUTH succeeded

Airport : RSN handshake complete on en1

en1: BSSID changed to 20:11:4b:73:97:e0

The above it the last line I receive when trying to start in Verbose mode.

Laptop will not start from Power Button, Safe Mode, Recovery Mode, REgular MacBook Pro Hard drive, Installation DVD, Recovery Drive.

I also note that when it brings up the tray start-up screen, the power light on the front of the Lap Top goes out.


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January 21, 2014 at 08:23:40

Finally got to an Apple Store in early January and had problem diagnosed within minutes. The striped screen after the apple logo was confirmation for the tech that the logic board was hooped.

Service experience was great.


message edited by BrianDunn

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January 21, 2014 at 09:04:53
Thank you for the update… Being relatively new to Mac systems (I have a 3yr old Macbook Pro, and a 9month old Mac Mini - and an iPad 2 - just to complete the family) familiar with some issues that can crop up, but a lot to learn - not the least the fixes various…

My Macs area both dual boot one Win7 t'other XP (Bootcamp/Parallels). There are some things that can't be done with Mac OS - not the least defeat/bypass regional coding on movie dvds. In windows there is AnyDVD that gets around most regional issues with most dvd players; but no such workaround/util for Mac (anymore).

Back to your service call - was it (logic-board) an expensive item to replace?

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January 21, 2014 at 10:37:48
Hi tyir:

My Mac is almost 6 years old mid 2088 manufacture. Apparently they don't usually repair Mac's over 5 years old due to parts availability. However as mine was not yet declared obsolete they did a re-conditioning for a flat rate $310 (US) plus taxes. That included Logic Board, a left in/out board, a internal cable and a new battery. I know the battery alone is over $100 US as I replaced one a few years ago. The flat rate invoice states $210 part and $100 labour. So overall I thought it was quite cost effective especially as the Apple Reseller would not give me either a price or an expected repair timeframe without a $60 check in fee.

BTW: Apple Store promised to have the computer back in 5 days and it was ready for pick-up in 4 1/2 including a weekend.


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