GRUB loading, please wait...Error 18

[1234543212345]

I have recently installed ubuntu on a old desktop pc but i think the harddrive i've put it in (250gb) is too big for the bios to reconise it properly.

the error i get is:
Verifying DMI pool data.......
Boot from atapi cd-rom:not found...
Grub loading stage1.5.

grub loading, please wait...
error 18

First time i try to install from disk, everything works perfectly then at the end when i restart it restarts and i get this error.

how would i perform a bios upgrade? and/or fix this problem

 

[1234543212345]

Now all i get when i try to install/try/check disc for defects is:

crc error

-- system halted

i changed the boot order to boot from hdd first and now i can't get it to show setup any help?

 

[1234543212345]

Thanks for the help, i put a 40gb harddrive in and it still didn't work, then after reading around on the internet and doing various things to it, it now works perfectly, i'm not fully sure on how i fixed it but it works now.