Can't boot up power mac g5

my g5 don't have diagnostic lights on the logic board.

Diagnostic LEDs

The Mac Pro logic board includes a set of LEDs to help service providers

troubleshoot the computer. The LEDs are located toward the rear of the logic

board, under the memory cage, next to PCI card slot 1. You can view these

LEDs by removing the computer’s side access panel and looking through the

memory cage to the logic board below. Diagnostic LEDs location on the logic board, numbered 1–8 from left to right

LEDs 2, 3, 4, and 5 are normally off and will illuminate automatically if an

error occurs. To read LEDs 1, 6, 7, and 8, you must press the DIAG_LED

button, which is adjacent to the LEDs. To press the DIAG_LED button, use

the nylon probe tool.

NOTE There is a position on the logic board next to LED 1 for a SLEEP

LED that does not have any LED installed. This is normal; the LED was

used only in development. To determine if a Mac Pro computer is in sleep

mode, watch the power LED on the front of the computer. It will slowly

change brightness levels if the computer is sleeping.

I didnt see any LEDs other then the power light, does the 2003 model have them on the board?

You can resolve many system problems by resetting the logic board.

There are three reset switches on the logic board that you can use to troubleshoot

various issues:

SMC reset: If the computer is experiencing a power issue, resetting the

system management controller (SMC) may resolve it.

RTC reset: If the computer is experiencing a booting issue, resetting the

Real Time Clock (RTC) may resolve it.

System reset: You can use this switch to determine if a computer that

won’t consistently boot from a cold start has power supply issues.