Installed new hard drive, now computer won't boot up.

So I installed my new Maxtor 300gig hard drive yesterday. Installing the hardware went fine. So then I went into drive management and such and formatted it. It works fine. But then this morning I have to restart my computer, and it won't boot.



Also it says I have no primary hard drive or something, like before the windows xp screen should pop up, there is the screen with all the information, and it says by primary hard drive that i have none.



My other hard drive is a Maxtor 250 Gig, and it has my OS and stuff on it.



Please help me, I have no idea what to do

check the jumpers on the back and set them correctly, other than that i dont know, i had a similar problem and thats what i had to do

Set the HD with the OS as Master, and the Backup HD as Slave.