I recently bought Kingdom Hearts for PS2 and my PS3 won't play it.
Suggestion:
backward compatibility for the PS3 with PS2 games is as follows on NTSC systems:
20GB (4 USB slots, fat, no longer in production) – YES
60GB (4 USB slots, fat, no longer in production) – YES
80GB with 4 USB slots (fat, no longer in production, bundled with MGS4 or Motor Storm) – YES
40GB (2 USB slots, fat, no longer in production) – NO
80GB with 2 USB slots (fat, no longer in production) – NO
160GB (2 USB slots, fat, no longer in production) – NO
120GB/slim (2 USB slots) – NO
250GB/slim (2 USB slots) – NO
any other up coming PS3's – NO
PAL systems only have one backwards compatible system, and that's the 60GB.
THAT'S 4 SYSTEMS THAT ARE IN FACT COMPATIBLE WITH PS2 GAMES!!! NOT 1 SYSTEM, NOT 2, 4!!!
in short: if it has 4 USB slots, yes. if it has 2 USB slots, no.
and as you can see, there are 3 systems that are fat, but can NOT play PS2 games. just because the system is fat does NOT mean it can play PS2 games.
all PS3s play PS1 games.
http://en.wikipedia.org/wiki/PlayStation_3#Model_comparison
the download that others are referring to is for the PS3s that already are backwards compatible. downloading it to a non-backwards compatible PS3 will do NOTHING but take up space on your hard drive! it will NOT make your PS3 play PS2 games!!!
"If a PLAYSTATION 3 is not backward compatible, you will not be able to add this function through any hardware (i.e., changing the hard disk drive) or software (i.e., updates, homebrew) upgrades or modifications. "
that came DIRECTLY from Sony's own website: http://playstation.custhelp.com/cgi-bin/playstation.cfg/php/enduser/std_adp.php?p_faqid=232&p_sid=1P9bCDwj
and no, not all PS2 games or PS1 games will work. the 20GB and 60GB come the closest to being fully backwards compatible with PS2 games, but they still do not play 100% of those games or PS1 games. if you buy a backwards compatible PS3 and want to know which of your PS2 games work, check this link: http://www.us.playstation.com/Support/CompatibleStatus
I dare anyone to steal my answer again. this is MY answer. I took the time to type this all up. yes, every time someone asks this question, I do copy and paste. but I'm copying MY work, MY answer.

{ 6 comments… read them below or add one }
Because only the first generation PS3s had full backward compatibility. If yours was bought new, recently, then it is very limited and can only play a select number of PS1 games.
Correct answer from Jason W and the reason why in the new Ps3 take away the retro-compatibility it's to
lower the production costs of Ps3.
I'm pretty sure it's not an update issue. in the slims they removed the hardware necessary for backwards compatibility, but I remember hearing that there weren't that many games supported for it anyway which is probably why
they got rid of it. they would rather port the popular games to the ps store, but they've only done a handful of those as well. if anything I should think an update would add support, but I don't think Sony's really putting lot of time into it
http://www.ps3comp.com/view.asp?flt=k&console=ps2
this is a comprehensive list of games the ps3 will play done by a 3rd party, looks like hearts is on there so… check your version
All PlayStation 3 consoles will play at least some PlayStation 1 games, regardless of the model, PlayStation 2 compatibility though is limited though only to models with 4 USB ports on the front. If you only have 2 USB ports on the front, your PlayStation 3 will NOT play PlayStation 2 games and there is nothing you can do to change this.
It is the NEWER PS3s that can't play PS2 games, NOT the "cheap models". All PS3s can play PS1 games. None of the updates takes away the ability to play PS2 games.
That's because you have got a newer model of PS3 and the newer models, well every model that is out now do not play any PS2 games. The reason you can play Dino Crisis for the PS1 is because every single PS3 model plays PS1 games.
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