I bougt a faulty Xbox crystal. The Xbox dident turn on so I open it up and replaced 3 caps that was bad. When I tried it again it starts up, but freezes on the Xbox logo. I turned it off and tried again and suddenly it worked and went in to the games archive. Then I turned off and now it refuses to go onto the boot menu again. The unit keeps freezing at the xbox logo.
I suspected bad solderjoints at the modchip so I resolder all joints including the joints on the Aladdin chip. But no luck.
This unit has the clock capacitor besides the IDE connector and it looks fine.
There is no visible corrotion on the board.