Press Volume Down button & the Power Button at the SAME time to take a screenshot on Android 4.0 ICS. The screenshot will be added to the /sdcard/Pictures/Screenshots folder.

Source: How to take a screenshot on the Samsung Galaxy S2 (free - no app required!) | Droid Lessons

 

It either brings up a task manager or locks the screen, No snapshot

 

To take a screen shot, you must now HOLD the VOLUME DOWN button and the POWER BUTTON..it takes about 2 seconds and you'll hear the click..hope this helps!

 

hold POWER+HOME until you hear the shutter click.

 

Process is same but use Home button instead of Volume(-) button

 

Thanks to the last reply from JellybeanS2.
Using the home button and the power button does work.
You do have to be super careful to press them together at exactly the same time though and then hold them both for a second or two.
I hope they don't change the combo again!

Thanks to RipGroove too.. Reading the thread again I see you answered your own question already...
All is well again

 

Can you please change the tag to include the keyword "screenshot" one single word.... I din't find a thread with this keyword and ended up creating one more.

Thank you so much for your post. I was able to capture screen by simultaneously pressing home and power button and holding them together for few seconds.