MacBook White Unibody doesn't detect new HDD

I'm trying to upgrade a MacBook from mid-2009 (it's the A1342, MacBook 6,1) with a new hard disk. The original one was a 250GB and the new one I'm trying to install has 500GB and it's a Toshiba. I've already created an Apple partition map in the new disk and formatted it to Mac OS Extended (Journaled), but the Mac always shows me the folder icon blinking with the question mark. I've tried booting from the original Install DVD and from the Snow Leopard DVD, with the option key and "C", but none of them seems to work. It doesn't show anything, not even the boot options. When I try the old disk it boots just fine. Do you have any idea what I'm doing wrong?