Boot up into OS ONLY with D key hold?

hi all, first, thx for reading the problem that i have.
some days ago, my macbook (with leopard) suddenly run very very slow , so i gave it a restart. this was where the problem began.
i could not boot into OS anymore, but only gray screen appear(no apple logo, nothing at all). then i just turn it off with holding power button. after wait for an hour i tried boot up again, but just the same thing.
i gave up to save or backup anything i had in it and did an "erase and install" of Tiger (my Leopard is a drop-in dvd, which need Tiger installed in order to install Leopard).
i had tried like two hundreds time of re-erase, re-partition and re-install the OS, which result the same thing : not boot into Tiger unless the D key hold. if i don't hold any key when boot up, the gray screen with nothing appear again.
note: i tried upgrading Tiger to 10.4.x or using drop-in Leopard DVD to install, did not help on anything but even worse, not boot up with D key hold or any key, no key hold
here are what i tried to fix the problem, but none of them help---------------
with install DVD insert:
hold C - In Disk Utility, "verify / repair disk", "verify / repair disk permissions", seems ok, no error
hold D - did hardware testing, both short and long test, no error
without any disk insert:
hold cmd+s (single user mode) - gray screen with nothing
hold Shift (Safe Boot mode) - gray screen with nothing
hold v (Verbose mode) - gray screen with nothing
hold option (select volume) - no volume appears, but i see the cursor
hold D (???) - ya, i boot into OS, but this is not what i want! holding D every time it boots up? you gonna be kidding me.
Reset NVRAM - not help
Reset the PRAM - not help
and also every step in this page: http://docs.info.apple.com/article.html?artnum=303234
anyone has an idea whats happening? the only thing i want is, boot into OS normally.

UPDATED: when i hold D on boot up, a folder icon with question mark on it appears very short time then Apple logo and the gear thing comes up, then go into the OS

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