boot error

Question :
If we r getting in disc boot error.
At initial stage what We need 2
check.
Answers:
1.Enter into the BIOS and check
whether your hard disk drive is
set as first boot device,if not then
set it as first boot device in the
boot device priority.
2.If the problems exists,then you
have to boot the system with a
new operating system cd and
install a new one.
3.Side by side check the RAM also
for the connection...