I did a check of the log folder size, it's only 1.3 mb.
[root@web1 xxxxxxx]# du -sh *
4.0K cgi-bin
52K etc
8.0K fcgi-bin
4.0K homes
1.3M logs
139M Maildir
99M public_html
4.0K tmp
I feel kinda hopeless...
HTML files work, but not PHP... :( thanks for your help, please shot any other idea so I can try , many thanks!!