IBM Dx360 M2 failed to boot RedHat from harddisk

Hi Ben

my name is Ben, i am from. one of our client recently brought 6 dx360 M4 server. Their requirement is to install Red Hat 5.5 on those server. I tred to install Redhat on that. Installation completed, after that it's not booting from the harddisk. I tried this on other 2 machines, all are same.

after that i installed windows 2008 R2 on one of the machine by using server guide, the installation was successful and it's booting perfectly from the harddisk.

we want to finish this task very urgently. after linux instillation i want to migrate some services to this, current status is production got down.

Why Red Hat is not booting from the harddisk. Please help me to solve this issue urgently 

regards,
Ben