This warning is absolutely normal.
Originally Posted by bearmon2010
I'm also using a 40" Sony Bravia TV, running in 1080p mode through a HDMI cable. This warning appears when running DMC4 off it's disc on my 3.50FW PS3. Now, with regards to your black screen, are you keeping a disc in the BD-ROM when trying to load? If not, I recommend doing that. If that still doesn't work, copy it to the internal and try running it with a disc in.
If it -still- doesn't work, you may have a bad rip.
60GB (120GB WD Scorpio Drive) PS3 (CECHA01, NTSC), 3.7OFW
60GB (640GB Samsung Drive) PS3 (CECHC04, PAL), Kmeaw 3.55, Repaired (Dead Laser)
PSP-1003 FAT, CFW5.00 M33-6 & Prometheus v2
X-Box 360 Xenon (JTAG'ed, 500GB HDD)