pc won't boot after linux intstalation

[teis]

I'm trying to install Fedora 9 on a Dell OptiPlex GX300 machine. The instalation runs properly, but when the computer restarts after the instalation, it simply won't boot, like there's no OS installed.
I tried diffrent Linux distributions, but nothing works.

This are the partitions, maybe it's usefull:
/boot ext2 100mb

Physical volume: System
- swap swap 1gb
- /srv ext3 4gb
- /usr ext3 4gb
- /var ext3 1gb
- /home ext3 4gb
- / ext3 5gb

I realy hope somebody could help me

[devils casper]

Hi and Welcome !

Which graphics card do you have? Does any distro boot up in recovery mode? Does any distro throw any error during boot up?

[teis]

Thanks for the help

graphics: matrox graphics MGA G200 AGP

no distro boot up at all, the only thing that is shown is a system error:
"Strike F1 to retry boot, F2 for setup utility"

(I tried Fedora 9 and Ubuntu 8.04; nothing worked)

When i boot from the openSUSE LiveCD, everything goes fine

[yancek]

You have a separate /boot partition which changes the way things are set up. Here's a link to a site about how to set up a separate /boot partition. It's specific to Ubuntu but the info on grub will be the same with one exception. The menu file in Ubuntu is /boot/grub/menu.lst, in Fedora, I believe it is still /boot/grub/grub.conf.

[devils casper]

no distro boot up at all, the only thing that is shown is a system error:
"Strike F1 to retry boot, F2 for setup utility"

Have you set Harddisk as First Boot Device in BIOS? Is there any security software/options available in your Motherboard's BIOS? It looks like installers are not installing Boot Loader in Harddisk or something disable it.

[teis]

Someone told me that the problem could be caused by a bad harddisk.
I already tried another one, but it was also a bad disk, so...

I just tried it again with a new disk i've got, and everything worked fine

however,
thanks for the help!