Weird keyboard problem - Late 2008 MacBook

[BrodinoCaldo]

Greetings!
I have a very specific problem with my MacBook.
Since I updated it to 10.11 the keyboard doesn't work properly when I start up the computer.
What happens is basically that the "A" key and the backspace one don't work, but if I press them repeatedly and at the same time they start working again...
Can it be a OS problem or is it more likely a hardware problem?
Sorry for my poor English, hope I've been clear.
Thanks to everybody who reads this!

 

[popatim]

Smart looks ok, When was the last time disk defragmentation was run?

 

[BrodinoCaldo]

Smart looks ok, When was the last time disk defragmentation was run?

I believe I never did... It wasn't mine I found it lying in another room...

 

[Mousemonkey]

Smart looks ok, When was the last time disk defragmentation was run?

I believe I never did... It wasn't mine I found it lying in another room...

You just walked off with somebody else's laptop?

 

[BrodinoCaldo]

Smart looks ok, When was the last time disk defragmentation was run?

I believe I never did... It wasn't mine I found it lying in another room...

You just walked off with somebody else's laptop?

No ahaha
It was my father's. As I said, I'm not a really good English speaker

 

[popatim]

I suggest you return it to your father, he may have info on there that he was saving for a reason.
Otherwise, download defraggler and run it on the drive.

 

[BrodinoCaldo]

I suggest you return it to your father, he may have info on there that he was saving for a reason.
Otherwise, download defraggler and run it on the drive.

He agreed on giving it to me a while ago.
He left it there because he bought a new one.
I'll try what you suggest.
By the way he never did things other than writing/editing work documents that now are in his new laptop.

 

[BrodinoCaldo]

I suggest you return it to your father, he may have info on there that he was saving for a reason.
Otherwise, download defraggler and run it on the drive.

Defraggler is only avalaible on Windows and all the other apps that do the same cost quite a lot...

 

[popatim]

Sorry, forgot this was a Mac, have a friend with a PC do it then or run windows in bootcamp if you can. Mac's don't have a real need to defrag often and there's no free utility sadly

 

[BrodinoCaldo]

Sorry, forgot this was a Mac, have a friend with a PC do it then or run windows in bootcamp if you can. Mac's don't have a real need to defrag often and there's no free utility sadly

Thanks for your help anyways