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c. Your system power. For ATX power supplies, you need to turn on the power
supply and press the ATX power switch on the front side of the case.
5. The power LED on the front panel of the system case will light. The LED on the
monitor may light up or switch between orange and green after the system is on.
If it complies with green standards or if it is has a power standby feature. The
system will then run power-on test. While the test are running, the BIOS will
alarm beeps or additional message will appear on the screen.
If you do not see any thing within 30 seconds from the time you turn on the
power. The system may have failed on power-on test. Recheck your jumper
settings and connections or call your retailer for assistance.
Beep
One short beep when displaying
logo
Long beeps in an endless loop
One long beep followed by three
short beeps
High frequency beeps when system
is working
6. During power-on, press <Delete> key to enter BIOS setup.
instructions in BIOS SETUP.
7. Power off your computer: You must first exit or shut down your operating system
before switch off the power switch. For ATX power supply, you can press ATX
power switching after exiting or shutting down your operating system. If you use
Windows 9X, click "Start" button, click "Shut down" and then click "Shut down
the computer?" The power supply should turn off after windows shut down.
Introducing BIOS
The BIOS is a program located on a Flash Memory on the motherboard.
program is a bridge between motherboard and operating system. When you start the
computer, the BIOS program gain control. The BIOS first operates an auto-diagnostic
test called POST (power on self test) for all the necessary hardware, it detects the
entire hardware device and configures the parameters of the hardware synchronization.
Only when these tasks are completed done it gives up control of the computer to
operating system (OS). Since the BIOS is the only channel for hardware and software
Meaning
No error during POST
No DRAM install or detected
Video card not found or video card
memory bad
CPU overheated
System running at a lower frequency
Chapter 3
23
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