2011 rings alarm bells for me, it was a bad vintage for lead-free soldering so 
graphics cards were fairly unreliable that year. I would expect it to fail at 
some point soon, just keep regular backups and keep an eye on new models, 
especially the Apple Silicon ARM-based Macs on the horizon

_
Regards
Sam Mullen

+44 (0)7747778022
[email protected]
www.macambulance.com


MacAmbulance Ltd.
Providing Affordable Mac/PC Support and Web Development

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On 23 Sep 2020, at 21:20, Tilly <[email protected]> wrote:

Hi Sam,
Thanks the PRAM reset worked - hooray! I've been on meetings all day today so 
good job it did!

However tonight I wanted to start up my own trusty MBP (one year older than the 
university laptop ...2011) for a personal Zoom meeting today and I am seriously 
worried. I press 'Start', hear the familiar chime and some whirring, see a 
white screen briefly and then it goes black. I tried the methods you suggested 
for the other laptop but neither of them change anything. Doing a Pram reset 
(and holding the keys down) it chimed, whirred and went from white screen to 
black continuously till I took my fingers off.
WAIT - I've just opened the laptop and the screen is there!!! I don't know what 
on earth happened! Anyway it looks like all might be well after all so false 
alarm. I just wish I knew what I did to help it in case it happens again!
Thanks again Sam,
Tilly

On Wednesday, September 23, 2020 at 7:10:51 AM UTC+1 Sam - MacAmbulance wrote:
> Try a pram and smc reset, see if that helps.
> 
> Pram : start up the Mac holding alt+cmd+P+R until you hear the startup chime 
> a second time, then let go 
> 
> Smc : Shut down the Mac, then hold down shift+ctrl+alt and push/release the 
> power button once, then let go of the other keys. Wait 10 seconds then start 
> up again 
> 
> _
> Regards
> Sam Mullen
> 
> +44 (0)7747778022
> [email protected]
> www.macambulance.com
> 
> 
> MacAmbulance Ltd.
> Providing Affordable Mac/PC Support and Web Development
> 
> MacAmbulance Ltd. is a registered company in England & Wales, registration 
> number 8466597
> 
> This email is intended solely for the addressed recipients and may contain 
> privileged or confidential information.
> 
> If you have received this email in error please notify the sender and delete 
> the email immediately.
> 
> 
> 
> On 22 Sep 2020, at 22:33, Tilly <[email protected]> wrote:
> 
> I was in Teams meetings all day today on my university's MacBook Pro and 
> during the last one I connected via my iPhone temporarily and left the 
> meeting I was in. When I went back to the laptop I couldn't get any sound. I 
> can't get sound for anything now. Checked Preferences and all seems normal 
> (internal speakers and internal microphone). I wasn't using headphones. Any 
> ideas what might have happened?
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