Man ... I think his PS2 got bitten by the "gold disc" syndrome.
It's when some resistors on the mobo get shorted. Since they carry the address lines from the I/O Processor (IOP) to the DVD drive DSP chip (It's also the interface to the DVD drive, how the PS2 access it and gets the data out) it can cause the "gold disc" problem by causing address information to be mangled, thus causing the IOP to read/write to wrong registers on the DSP chip. Sometimes this is serious enough to cause BSOD. It's easy to fix but requires a scrap mobo to take out the resistor pack.
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)