Bootloop after installing osx el capitan

[Gillepils]

Hi,

Since I installed osx el capitan my mac is in a constant bootloop. Sometimes it shows strange colors (see image) on the screen other times it is a blue screen with all verticale black lines.

I already resetted the pram and so without succes.

Someone any ideas on this?
[doublepost=1460832919][/doublepost]

Hi,

Since I installed osx el capitan my mac is in a constant bootloop. Sometimes it shows strange colors (see image) on the screen other times it is a blue screen with all verticale black lines.

I already resetted the pram and so without succes.

Someone any ideas on this?

Edit: now after more than half an hour it succesfully booted without doing anything. I ran the disk utility first Aid and restarted... Seems like he is back from the death...