Startup display flashes Apple logo, circle w/ line ,question mark folder

I attempted to install OS 10.6 SL and during initial install and restart my MBP display started flashing the grey Apple logo, circle with angle line thru it, and file folder icon with question mark in center. I can not get my MBP to restart. It just keeps flashing the symbols. as described.

After trying to get the system to start either with the install disc DVD or from the HD, without any success, I tried something a little desperate. I replaced the HD with the one that was installed originally. Of course, this HD was reformatted without any system. It, again, tried to start from the install disc DVD, as directed, but with no solution. After a gray logo screen for a couple of minutes it stopped the startup process, but did not shut down, I was still left with a black screen and nothing happening, until I hit a key and the whole thing repeated itself. I have since gone back and reinstalled the larger HD with OX 10.5 installed on it, but with no success. Obviously, it doesn't seem to be anything on the HD. If this was a PC I would think that I needed to reset the BIOS, but I am not that familiar with the ROM. Any further suggestions?

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