Need help starting an ISO through Devhook....

Hi guys...I have got a copy of GTA-LCS, which has been modified to work with 1.50 FW (changed the PRX files i think)......The details say that to start the game, i need to first start umd emulator, and then start mph loader.....but for some reason this method doesnt work for me....

so can someone please tell me how to start game in devhook and daxziso....

thanx in advance....

are u putting a umd in the drive?