Unexpected Shut down when moving macbook pro on my 'lap'

You already diagnosed the problem ... moving an MBP when the system is running (not asleep or shutdown) triggers the SMS to stop the HD. But you repeat that behavior while expecting a different result.

When a new disk is installed I hope you recognize what started this problem and correct your behavior.

Make a "Genius" appointment at an Apple Store.

Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.

Keeping your confidential data secure during hardware repair

*An SSD doesn't need to be zeroed.

Maybe you'll find this more helpful. Continue to use your broken computer as is.

I once had a problem like that on an Apple PowerBook about 10 years ago. It was caused by a loose connection on the motherboard, so that when I moved the computer the case would flex just enough to create a gap in the loose connection and the power cut would instantly shut down the computer. Only a trip to Apple service fixed it.

I'm not saying that's exactly what's going on here, and the MacBook Pro has a much stiffer case than the old plastic PowerBooks G3. My point is that it could be caused by a fault somewhere in the motherboard the you should have repaired, hopefully your warranty has not run out.

I am convinced it is a hardware fault of some kind because that problem should not be happening at all. Because of features like the SMS, today's MacBook Pros can withstand quite a bit of being moved around with no ill effects.

In the end, Linc's advice is good and helpful because this is probably something you cannot fix on your own. Your best option is to have Apple look at it.

Lincs advice was and is correct, you may not like that but it changes nothing. Your Mac needs competent diagnosis so either you figure it out or take it to Apple.

I do hope you take Linc's advice about backing up your data and clearing your personal information from the system. Always good advice when taking in your system, as Linc advised.

Sorry ... Linc was useless. Network's advise to backup and then take it in is what you are following.

These forums can be at least amusing.

People create "cut and paste" because it save typing. Which makes it easier to give detailed answers to users who need them.

Sorry if this is redundant.

Ioan007 wrote:

Makes these forums rather redundant then.

You're entitled to your opinion.