mysql出错,高手求教!

Question

第一次安装完之后,好用.但出现了点问题,然后再就启动不了了.
然后我删掉原文件,重新编译,还是不行.
我用二进制模式,也进入不了.
具体的错误提示如下:
#./mysqld_safe
The file /usr/local/mysql/bin/mysql doesn`t exist or is not executable.Please do a cd to the mysql installation directory and restart this script from there as  follows:
./bin/mysqld_safe
See http://dev.mysql.com/doc/mysql/en/mysqld_safe.html for more information
#cd ..
#./bin/mysqld_safe
starting mysqld daemon with databases from /usr/local/mysql/var
STOPPING server from pid file /usr/local/mysql/var/mysqld.pid

注:我的第一次安装路径是/usr/local/mysql,但我把它删掉后,重新安装的并不是这个路径.而且我也没找到mysqld.pid文件.
这是为什么呢?谢谢大家