On Fri, 2011-07-29 at 02:44 +0530, sridhar sri wrote: > when i press the F11 i am not able go to boot options , for that i > used the del and esc, OK. Are you using SATA or PATA hard disks (HDD) ? What processor (CPU) does your machine have ? How much RAM does your machine have. Please note http://en.wikipedia.org/wiki/Booting is NOT a Centos web page. Every machine has different start-up options which can be DEL, F1, F2 or even F6 or F11. -- With best regards, Paul. England, EU.