Good installation practises for DMS3 V2 / V9 Modchips:

Wires D and E should be routed flat along the motherboard and should not cross any other wires.

Avoid passing the wires accross large BGA chips, since this will create interference The same principal goes for O and X. Failure to follow this rule can result in crosstalk between the wires and cause a black screen on boot.

***This is particularly important on V3 / V4 gap bios'.***

We cannot stress enough how important it is to pay attention to the length and thickness of the ground wire! This is a common error and is the cause of the majority of non functioning installations. Often resulting in a black screen on boot. Long, thin wires will cause "ground-bounce" between the DMS3 Modchip and the PlayStation 2 motherboard resulting in failure.

If your DMS3 Modchip fails with a black screen on boot, check the aforementioned points. It is likely that the install is at fault and not the DMS-3 Modchip. A replacement DMS3 Mod-Chip will not remedy a flawed install. Unless you fix of the cause of the problem, i.e. the wire length, type, positioning the DMS3 will not function correctly.

The DMS3 Modchip patches approximately 100 times more data than other ModChips such as Magic 3 and Messiah 2. It also draws more current due to the extra components on-board, such as the flash. It is therefore more sensitive to dubious installations.

Mod-Chips with a lesser feature set do not have the same current requirements and therefore are less sensitive incorrect usage of wire type for +ve and -ve.

Just because your wiring works with a Magic 3 or Messiah 2 does not mean that it follows basic electronic "good practices", nor is it an indication that the DMS3 Modchip is at fault.

If the above procedures are followed, your DMS-3 Modchip will function correctly without a glitch!

PS2 fails to boot (black screen):
Check points D-N. Fix your power and ground wires. Ensure that D and E are laid flat against the motherboard. Fix your power and grounds. Make sure you haven't bridged any pins on the BIOS chip of the PS2, the Actel on the DMS-3 Modchip or the flash chip on the DMS-3 Modchip.

PS2 games fail to authenticate:
Check points M-W. Fix your power and ground wires. Ensure that M is laid flat against the motherboard.

PSX games fail to authenticate:
Check point X. Fix your power and ground wires.

PS2 acts as though no chip were installed:
Check point C (Eject). If this wire is not connected, the chip may think you are holding down Eject and go in to Sleep Mode. The same will happen if C is bridged with ground, but in that case you will not be able to turn the PS2 on from stand-by using the Eject button. Fix your power and grounds.