Help Blank Screen Download Mode

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http://forum.xda-developers.com – is it a normal problem that when we flashed a Custom firmware on s5830i , Download mode ins't working ? i tried flashing a custom rom on my s5830i DDXLA2 Basband version DXLF1 Acecream and razodroid , upon flashing both custom firmware everything works good but when i tried to go to download mode all i can see is BLANK SCREEN . i already tried the volume up + down + power then insert the battery but still it doesn't work . my phone also is not detected in any odin . my odin version is 1.85 and Odin3_V3.07 . hope there is a solution with my problem thanks ! (HowTos)