No entry sign - problem to boot system

[smoovb]

Hello, I have problem with my macbook a1278 (i5, 8gb RAM) last night I close screen and replace disc with other system. I open screen there was system from last disc, i turn off macbook and turn on again.
The problem is that el capitan system try to boot and when it is in 60% "no entry" sign.

I dont know what can i do whit this how to fix it..
I try start in recovery mode but when i try to reinstal el capitan ther is no system disc (only recovery - no instal parttion).
When i open disc utility my system is grey in left and i can't to fix this problem.

do you have anny solution in this case,

 

[KALLT]

Can you post the result of this Terminal command here?

diskutil list

Have you tried repairing the disk (the one at the top) in Disk Utility?

 

[MacForScience]

Typically this means directory problems or disk problems. It is also possible that this is a result of a failed install. Your best bet is to check the disk with SMART Utility or some such, and make sure your drive isn't failing. If it isn't then you need to examine the volume in terminal and see if you have a failed install. You can also try verbose mode at boot to see where the system is throwing the prohibitory sign.