Simple . . It seems that the wires not have glue on it . .
The Wires of your PS2 only have security by the Solder and the Chip so they lately let it go and go sit in strange positions . . .
Some Wires will fall in your PS2 and could damage something, open up your PS2 and glue the wires on the Mainboard, or just use double-sided tape and put it on al the wires in a bundle . . .
then put the double-sided tape (must be universal tape) on the mainboard so it stay's put . . .
Then check al connections and reassemble your Ps2 unit.
Start it up and that should do the trick . .
If you need help . . just mail me at: firstname.lastname@example.org
Xbox: 100 Euro (X-ecuter 2 Pro)
PS2: 100 Euro (Mini Apple Pro)