Though't I'd start a thread for people to post their success/failure with running the GTA Hello World program so we can get an idea of which machines can run the exploit.
Ceramic White PSP (from Giga pack) with FW 2.5. GTA European version - Works.
After the hello world message appears and I turn the power off, it won't come on for a few seconds, the power button just keeps blinking. What is the cause of this?