My problem sounds similar to the guy w/ the mac. I bought a new HP gaming system.
Processor: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
Video Card: GeForce GTX 260, Memory 1.75 GB
Installed steam and L4D2. Won't boot, but doesn't crash. Completely reloaded everything after wiping steam. Still won't boot. Tried every compatibility mode. No behavior change. Loaded updated video card driver
. No change. Ughh. Any suggestions?