have you tried restarting your phone? Next time face any issue try restart first.

try installing tweak flash plugin..and if u dare,try to OC to 800-900mhz..but bear in mind that not all game in facebook can play in N900...

i sent my N900 to berjaya plaza NCC because of my wifi problem..they said they will upgrade the software..but i told them i've flashed (they dont understand flash,so its upgrade) numerous times, but it still the same..

i told them to check the antennae..they said have to leave the phone at NCC..i said ok laaaa..of coz laaa have to leave...

then, they didnt even bother to call me when its ready..i called them asking if the phone is ready for collection then they said yess...i was like.. "wtf,y didnt u inform me?"..they said "sorry sir..we are very busy"..i said ok la..

then,when i arrived, i asked the staff..what did they do to the phone?has the antennae been checked?to my surprise...they said they only upgrade software..so here goes the dialog..

me = what did u do to the phone?
staff = we have upgraded the software for you sir
me = didnt i tell u that i have already upgraded the software so many times?i asked you to look at the antennae..not to upgrade..
staff = after software upgrade, all ok already...
me = since u just upgraded the software, u didnt even bother to call me when its ready for collection??
staff = sorry sir..but the problem has been solved..
me = ok then..but if the problem is still there..i'll smack your forehead laju2..
staff = ok sir..
me = ok?really ar??can smack?

then i went back home..tested..still the same..sometimes can connect,sometimes dont..i was like fuk...they dont even have wifi connection at the centre for me to test.wasting my time/petrol..

any idea where is the most recommended NCC to go?

my batt can last from 8am to 8pm, bout 1 hour 3g, 1 hour wifi, 100 smses, around there..

yeah. if higher iso ur picture will got more noise

u cant. not how. u just cant with fcam

Add to list:
WarCraft2 & StarCraft2 using Stratagus Engine (incomplete).
Theme Hospital using 3rd party engine, not complete.
I think there is also C&C: Red Alert

There is Quake III: Arena in the repos.

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Added on October 22, 2010, 5:44 pm

Try restart your phone.

May I know what format are you trying to play?

This post is from Android on N900

flash it! flash it! lol.. jk..
what did u do b4 encounter this prob? o.o

This thread exist to guide N900 users & users wannabe to right direction.Not to spoonfeed everything.

Now to your problem.
What type of video are you trying to play?
Try installing MPlayer + SiB.This should allow you play most of avi/mpeg/mp4/mkv/flv files providing the resolution is not too big(eg:720p)
But if you're talking about unable to play any video with default video player after trying to play an unrecognized video format that it's a known bug in Maemo 5 & it's fixed in upcoming PR 1.3

Try the Mplayer + SiB 1st & may the force be with you. 
Trouble is people don't really have time or lose interest halfway porting a nice game
Easy peasy.Follow the guide in 1st page you should be able to install NITDroid.