This is a very simple tutorial to help you run Samsung Galaxy S3 in recovery mode and download mode especially you have just completed the ClockWorkMod Recovery installation as well as rooting. If you have not yet done that, see these 2 posts which provide you the easiest way to root and hack your SG3, i) install CWM & root with CF-Root & ii) All-in-one Galaxy S3 Toolkit.

How To Run Samsung Galaxy S3 In Recovery Mode?

1. Turn off SG3.

2. Press and hold Home + Volume Up and press Power button.

3. Wait until you see Recovery Mode, need about 3-5 secs.

How To Run Samsung Galaxy S3 In Download Mode?

1. Turn off SG3.

2. Press and hold Home + Volume Down and press Power button.

3. Wait until you see Download Mode with Warning! Screen appears, need about 2-3 secs.

[Via XDA]