Dell OPTIPLEX 990 Service Manual download pdf (Page 75)

Problem Description A possible system board resource and/or hardware failure has

occurred.

Troubleshooting

Steps

• Clear CMOS.

• Disconnect all internal and external peripherals, and

restart the computer. If the computer boots, add the

peripheral cards back one by one until you find the

bad one.

• If the problem persists, the system board / system

board component is faulty.

LED

Power Button

Problem

Description

Some other failure has occurred.

Troubleshooting

Steps

• Ensure that the display/monitor is plugged into a

discrete graphic card.

• Ensure that all hard drives and optical drive cables are

properly connected to the system board.

• If there is an error message on the screen identifying a

problem with a device ( hard drive), check the device

to make sure it is functioning properly.

• If the operating system is attempting to boot from a

device (optical drive), check system setup to ensure

the boot sequence is correct for the devices installed

on your computer.

Beep Codes

The computer can emit a series of beeps during start-up if the display cannot

show errors or problems. These series of beeps, called beep codes, identify

various problems. The delay between each beep is 300 ms, the delay between

each set of beeps is 3 sec, and the beep sound lasts 300 ms. After each beep

and each set of beeps, the BIOS should detect if the user presses the power

button. If so, BIOS will jump out from looping and execute the normal shutdown

process and power system.

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Dell OPTIPLEX 990 Service Manual Page 75