System Lag on DVD read (double post, not sure where this goes)

When I try to run a DVD in any media program (VLC, Media Player Classic, WMP) I get a fast screen flicker and video/audio starts lagging.

System Specs:
Motherboard: Abit AB9 Pro Intel 965 LGA775
Processor: Intel Core 2 Duo E6600 (OC to 2,6ghz)
Harddrives: 2x Samsung T166 500GB 7200RPM SATA RAID0 (1Tera), HD501LJ and HD502LJ
RAM: Corsair DDR2 KIT 2X1GB 667MHZ and Kingston Valueram 2048MB 800MHZ
Gfx-Card: Club 3D Radeon HD 4870 1GB OC
Power: 400W
CD/DVD Drive: TSSTcorp CD/DVDW SH-S182D (Samsung SH-S182D)

The underlined components have been added “just” after the previous time I tried reading a DVD (this is when it still worked). I don’t use DVDs too often, so the problem might have nothing to do with the change in components. I’m pretty sure the problem isn’t DMA related (PERHAPS I have some wrong configs in my bios, as I had to mix about it a bit to get RAID0 working). (Not sure about the next thing in English, but I’ll try to improvise on what I know: ) The seconday IDE-Channel in my Device Manager shows PIO-Only, though it has DMA, if available set to on, though I think this is unrelated.

I also had an old 160gb HD on the same IDE-Cable as my CD/DVD Drive, but I removed it when installing my new 500gb drive. The thing I suspect here is that I don’t have enough power output, can this be true? Everything else works fine, I can play games, no problem. But when I try to watch movies from DVDs the problem occurs.

DxDiag:
http://paste.servut.us/plain/duav

I have tried this thread:
http://club.cdfreaks.com/f61/troubleshooting-enabling-checking-dma-windows-vista-xp-2000-me-9x-101616/

Maybe a problem with the SATA controller setup.