Help - I think I might have killed my Mac

Hi

Thank you so much, I will try this but can't do it today -

There is nothing on the Mac that matters as it is all in iCloud as well and any software I have , I can get copies as I have the keys.

I think I can do all this if I can just get the screen to come on - I will get back to you and let you know what happens. Thanks once again

I’m really grateful for your help. I am feeling more hopeful now. When you google the problem you get so much technobabble and long ways round it seems daunting.

At at least if I get it up and running again , if I get more problems I have a working system to fix it.

Just to say a massive thank you

In the end I restored to mavericks via shift +alt +cmd +R or whatever the bloody keys are called. I then reinstalled and set up my office 2011. Ok so it will not update but hey ho, then I upgraded to High Sierra from the app store - still got to add some software back in but that should be easy enough. Only thing I can't work out is I now look like a golf ball (you know the pic when the screen is locked.

It also seems to have majorly cured the draining battery life. I left in in sleep for almost 24 hours and it had not dropped even 1%

Thanks again- the golf ball is a stock image that appears on the login screen.It used to be my pic and even a couple of times after I had initially restored it, it stayed the same. It's no biggy . I can live without it.

Sorry I am being thick again- when you say wipe the partition I guess you mean the Macintosh HD - the other seems to be the recovery partition.