HELP! on psp phat

[xSLICKVICx]

Hi i recently got a psp from a friend of mine, I opened it up and everything seems fine. But when i power it on the green light comes on but nothing shows on the screen and there is no sound ethier. I know the lcd screen is not broken because i already tested it with my other psp. So i check the sound and its in there good and no wires are broken. So i really dont know what the problem could be. If someone could help me out i would really appreaciate it. Thanks

PS. The psp use to turn on fine the only prob was the wifi error code (cant go on internet)

[Jumbo]

Wifi card is messed up is the sound problem, Just try a diff one that is the same as mobo and the LCD maybe blown Backlight fuse?

[whis]

Sounds like a brick to me.

[ApheX]

Sounds like a brick to me.

I agree. have you tried flashing the firmware?