Test it with CDs too. Before putting the RS2004 chip to blame, you should check all the fuses. A damaged laser can also cause that behavior.
Usually a blown laser will still be able to read CDs unless it has the coils blown Boards newer than GH-032 won't blow coils as they have protection.
GH-035 (70012/V12) is affected by mechacon crash/burnt coils syndrome though.
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...)