Solve : hdd not being recognized sometimes....?

1.	Solve : hdd not being recognized sometimes....?
Answer» ok i have three hdd in one computer two are on a ide controller card the 20 gig and the 9 gig the 250 gig is directally PLUGGED into the motherboard. when i boot windows xp pro sometimes the 250 is recognized and sometimes not same with the 20 gig. sooo i don't know whats happening. i think it might be the power supply.... but i don't know. it's a 400 watt antec. that the best i can describe it for now and IDEAS would be great or somehow to trouble shoot.. btw i don't have a bigger PS. so i can't test that.btw after windows scrolls the blue BAR across the screen there is an abnormally long PAUSE until windows ACTUALLY shows somthing on the screen. i think this might be from the older hard drive i am using but i'm not sure.

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