Hi there,

I've got a working iPC OSX86 10.5.6 machine. Audio and graphics are
working normally.

When I play a movie (divx, xvid...) in QuickTime it plays normally, but
when I play it in VLC I get a black screen but the audio is played.
I've tried every setting under video tab in VLC but no results, I always
get the black screen with audio...
Is there a solution to this problem??
If I can play it in QuickTime why can't I play it in VLC??

BTW, I have ATI Radeon 3870.

Did you get QE/Ci with your video card? about divx you need to download the codecs to play them

ATI Radeon HD 3800:

Chipset Model: ATI Radeon HD 3800
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: ATI (0x1002)
Device ID: 0x9501
Revision ID: 0x0000
ROM Revision: 113-B1480A-236
EFI Driver Version: 01.00.236
Displays:
SyncMaster:
Resolution: 1280 x 1024 @ 85 Hz
Depth: 32-bit Color
Core Image: Software
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Not Supported
Rotation: Supported
Display Connector:
Status: No display connected

There, your not getting QE/CI support, try to solve this 1st, google it I think that video card should get full support