why does my ntsc game dont work on my ntsc console?

There is multiple ntsc regions. Japan, Asia,, the US and South America

If my console was bought in singapore, is the console NTSC/J or NTSC/U? I have some games which are marked as NTSC/J and the others are marked as NTSC only..So AC 3 Pal will or will not work on my console?

Hi, I have never known NTSC games to work on a PAL console, (that does not mean things have not changed), but after looking on the Play Asia compatibility list it seems some of yours have region free versions, my Ninja Gaiden 2 has NTSC/J printed on it but
it's region free, as far as the list goes GTA IV NTSC does not work on PAL consoles.

[quote user="Mister Gwyther"]Hey there! A US console is NTSC video. Do the TVs you have in Singapore NTSC or PAL? If PAL, they will not work.[/quote]Why do you think that is the case?

PAL and NTSC long ago stopped being an issue. I live in the UK, a PAL country, and can watch NTSC formatted content on my television without a problem.

I can even play games from the USA (a NTSC region) on my Xbox 360 providing they are region free, an example of which is Ghostbusters: The Video Game.

Providing the console has the correct power adaptor(s) then PAL and NTSC should really not be an issue unless he is using an ancient television.

Not True about the NTSC discs. I have lots of games that are NTSC and some of them work and some dont.