Blank screen after POST

[gravityxx]

So I finally got a HDD for my PS2. I got excited and decided to plug it in right away. Then after shutting down, connecting the HDD. The system detects it, but it would stay on the POST screen for about 20 seconds. And after that I would get a blinking _ . Only keys that works are ctrl+alt+del, and the power button. Then I thought it would be the new HDD, so i unplugged it and booted again. Same result.

Putting the HDD in the PS2 works fine, I can copy games on it and such.
After long sleepless night of googling, and trying everything I read.. same thing still.

I tried..
1)Using repair console
>chkdsk /f and /r
>fixmbr
>fixboot
2)Repairing install option
3)Cleared CMOS, pulled the battery
4)Using 1 stick of ram + no ram
5)Unplugging orginal hdd, Installing windows on another HDD, got the same blinking _
6)????
7)Tried Gparted liveCD, stuck on keymaps part ==;

Halp!
Windows XP btw

Fixed

 

[gravityxx]

Well, I found out the problem.
With UDMA mode set to auto for the hdd it doesn't boot at all, when it's disabled, it boots,
but it's slow like hell. Anyone know why? UDMA was on before, and now it doesn't work