Sun Microsystems Ultra 2 series Service Manual page 51

2. At the keyboard, simultaneously press and hold the Stop and D keys and press
the Power-on key.
Note – Video output is disabled while POST is initialized.
Note –
To view the POST output results, a tip connection must be set up. See
Section 3.2.1 "Setting Up a Tip Connection" on page 3-2.
3. Verify that the keyboard LEDs light to confirm the system is in the POST mode.
Verify that the keyboard Caps Lock key LED flashes on and off to indicate the
system has enabled POST.
4. If a failure occurs during POST, a keyboard key LED other than the Caps Lock
key LED may light, indicating a failed system component.
See Section 3.8 "System and Keyboard LEDs" on page 3-15.
5. If the Caps Lock key LED fails to flash after the Stop and D keys are pressed, the
POST has failed.
See Section 3.8 "System and Keyboard LEDs" on page 3-15.
Note – The most probable cause of this type of failure is the motherboard. However,
optional system components can also cause POST to fail.
6. Before replacing the motherboard, remove any optional components, such as PCI
cards and memory, and repeat the POST.
Note – Non-optional components such as DSIMMs, the motherboard, the power
supply, and the keyboard must be installed for POST to execute properly. Removing
the optional system components and retesting the system unit isolates the possibility
that those components are the cause of the failure.
7. To view additional POST failure information, establish a tip connection.
See Section 3.2.1 "Setting Up a Tip Connection" on page 3-2.
3-16 Sun Ultra 2 Series Service Manual • July 1996
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