mysql slave replication doesn't work due to error 1236
Sounds like this sequence happened:


The slave went down, but you did not notice it.
A few days(?) went by.
The binlogs (on the Master) were automatically purged (either by a script you use, or by expire_logs_days)
Now you noticed the Slave was stopped, but it is too late.


If this is not the only slave, stop another slave and clone it to rebuild this one.

If it is the only slave, you are stuck with rebuilding the slave from the master.  Not fun.

But... You said the Master died and was repaired??  Well, look at the timeframes, and other things that I suggest above.  How many days (#2); how fast is the purging (#3), etc?