Some noob questions

[Inevitability]

Hello everyone I already posted before not sure how much you noticed my posts. All happy I upgraded to Nexus S from Symbian phone and I am amazed by Android. I have Gingerbread 2.3.4 so I decided to upgrade to 2.3.6 . On step 2 I found a problem because when I reboot my phone and hold power + dedicated volume button nothing happens it just powers up normally and asks for my PIN. What do I do to access that place?
Do I need to root my phone to install 2.3.6 or 4.0.3 ? I admit I am eager to see ICS. If I can why not?
When is Google publishing ICS fix for that buggy version currently available?
How come Galaxy S can't support ICS (according to Google, we have seen by ROMs that it can) yet Nexus can?

I am also looking for a more advanced video shooting app which will let me use different resolutions. I would like 640x360 or 720x400 widescreen resolutions not the default one.

TY in advance

 

[razvan06]

1 Try holding VolUp[first]+Power[second] for 5 seconds and it will be ok;
2 You do not need to root to install 2.3.6~4.0.3 ,however you NEED to root if you depend on your carrier [locked phone] for the updates;
3 Trust me ,you do not want to try ICS right now ,it's cr@p at this moment ,wait for it ,don't rush ...and no ,we have no idea when google is going to release an update right now;
4 Because the Nexus S is a Google phone ,and depends on Google alone ,unlike SGS that depends on Samsung to release ICS for it !
5 Camera app - i do not know

 

[Inevitability]

1 Try holding VolUp[first]+Power[second] for 5 seconds and it will be ok;
2 You do not need to root to install 2.3.6~4.0.3 ,however you NEED to root if you depend on your carrier [locked phone] for the updates;
3 Trust me ,you do not want to try ICS right now ,it's cr@p at this moment ,wait for it ,don't rush ...and no ,we have no idea when google is going to release an update right now;
4 Because the Nexus S is a Google phone ,and depends on Google alone ,unlike SGS that depends on Samsung to release ICS for it !
5 Camera app - i do not know

Thank you man! I installed 2.3.6 now, with no problems. Now waiting for ICS. Thanks again...