Help problem get in download mode

[stilonas2000]

hi guys i am new for android.I have samsung galaxy s3 GT-19300 4.0.4
when i try to get into download mode stuck in this robot picture with red triangle down(lay down actually) and only recovery utility appears.Iwant to proceed with root but stuck in (unable) to download mode please help

 

[davidmanvell]

Think we need more information to help you.

 

[GTWalling]

hi guys i am new for android.I have samsung galaxy s3 GT-19300 4.0.4
when i try to get into download mode stuck in this robot picture with red triangle down(lay down actually) and only recovery utility appears.Iwant to proceed with root but stuck in (unable) to download mode please help

You are holding the Volume Down, Home button and Power at the same time?