Steam Bug?

Hello,
I just recently bought the Steam version of PCM13, installed it on Steam and when I started it up, the white screen was up for a minute or two, then yellow mouse pointer plus black screen, I waited for like 5 minutes before pressing ESC button twice because there is no video showing (I can't hear it because I'm deaf) and when I arrived in the main screen, it's lagging severely. Fortunately, it's not crashing and I can ALT+TAB a little bit.
What can I do to help fix this problem???
I just recently bought the Steam version of PCM13, installed it on Steam and when I started it up, the white screen was up for a minute or two, then yellow mouse pointer plus black screen, I waited for like 5 minutes before pressing ESC button twice because there is no video showing (I can't hear it because I'm deaf) and when I arrived in the main screen, it's lagging severely. Fortunately, it's not crashing and I can ALT+TAB a little bit.
What can I do to help fix this problem???