Help with PSX games on PSP.

I cant seem to play all the PSX games i downloaded on PSP. My firmware is currently 3.10 OE-A. I have followed G.C's tutorial. When i choose the PSX game, it jus hang at the PS icon.. Anyone can help me with this? The games i m tryin to play are Chrono Cross, Grandia, Thousand Arms and Xenogears.