With the BIOS self-test failure bootPOST power-on self test: is the computer powered on, the system performs a self check routine. This process is often referred to as POST--post (Power On Self Test). Almost all of the system's hardware detection.
POST how to test?
after the motherboard is receiving power, the system first (Power On Self Test, power-on self test) procedures to check the internal devices. When we press start key (power switch), control is handed over to the BIOS of the system to complete, because the voltage is unstable, motherboard control chipset to the CPU to issue and maintain a RESET (reset) signal to the CPU is initialized, and waiting for the POWER GOOD signal from the power supply (power ready signal). Dang power began stable power Hou (certainly from not stable to stable of process also just short of moments), chipset will withdrawal to RESET signal (if is manual by Xia computer Panel Shang of Reset button to heavy Kai machine, so release the button Shi chipset on will withdrawal to RESET signal), CPU immediately on from address FFFF0H at began implementation instruction, this address in system BIOS of address range within, regardless of is Award BIOS also is AMI BIOS, Here are just a jump instruction, jump to the real startup code in the system BIOS. System BIOS boot code is the first thing to do is POST (Power On Self Test, power on self test), because many computer hardware devices (including memory, interrupts, and expansion cards), to detect these devices work correctly. This process is one by one, BIOS vendors for each device is given a detection code (known as POST CODE or power on self test), when tested in a setting, first write the corresponding POST CODE 80H (address) diagnostic port, when the device is detected by, then another set of POST CODE, to test the settings. If a test does not pass, and retained the POST CODE at 80H, testing procedures will also stop, and based on the alarm sound of alarm (BIOS makers for alarm sound were made by definition different set fails, the alarm sound is different, we can according to the different alarm sounds, recognize failures.
POST detect self test is in what order?
POST self-test procedure is roughly as: power-CPU-ROM-BIOS-System Clock-DMA-64KB RAM-IRQ-video card, and so on. Detect the video card used to process said key parts of the test, if key components have a problem, your computer will be in a pending state, traditionally known as heart failure. Another type of fault is called non-critical fault, after testing out the video card, the computer 64KB memory, I/O ports, soft hard disk drives, keyboard, Plug-and-play devices, CMOS settings for testing, and display information on the screen and error reporting. Under normal circumstances, POST process is very fast, we could barely feel the process.
POST detection code what does it mean?
when the system detects the error, will be carried out in two reports that display on the screen error message or alarm sound way to point out that the number of detected failures.
CMOS battery failed (CMOS battery failure).
reason: description of the CMOS battery power is running low, please replace with new batteries.
CMOS check sum error-Defaults loaded (CMOS errors on all check and load default config settings).
reason: this condition is usually due to insufficient battery power caused by, so may wish to try another battery. If the problem persists, it indicates that CMOS RAM might be the problem, best returned to the original address.
Display switch is set incorrectly (display switch configuration error).
reason: older jumpers on the motherboard monitor can be set to monochrome or color, this error indicates that the motherboard on the set and do not match the setting in the BIOS, reset.
Press ESC to skip memory test (memory checks, you can press the ESC key to skip).
reason: if it does not have the BIOS set quick power on self test, then the power will perform a memory test, if you don't want to wait, you can press ESC key to skip or to open Quick Power On Self Test in the BIOS.
HARD DISK initializing "Please wait a moment ..." (hard disk initializing please wait for a moment).
reason: this problem on a new hard disk, simply cannot see. But older hard disk, start slow, so there will be the problem.
HARD DISK INSTALL FAILURE (hard disk install failure).
reason: hard drive power cable and data cable may not be plugged in or improper hard disk jumper error (for example a data cable on the two hard drives are set as Master or Slave. )
Secondary Slave hard fail (detection failed).
1. Improper CMOS setting (for example from disk but in CMOS with slave)
2. Hard drive power cable and data cable may not be plugged in or a hard drive jumper is set incorrectly.
Hard disk (s) diagnosis fail (error occurred when performing a hard drive Diagnostics).
reason: This typically represents the failure of the hard drive itself. You can try it on your hard disk to another computer, if the problem, it had to repair.
Floppy Disk (s) fail, or Floppy Disk (s) fail (80) or Floppy Disk (s) fail (40) (unable to drive a floppy drive).
reason: floppy drive ribbon cable is faulty or loose? Have connected the power cable? If these are no problem, buy a new one.
Keyboard error or no keyboard present (keyboard error or no keyboard present)
reason: connect the keyboard cable is plugged in? Connector damaged?
Memory test fail (memory test failure) causes
: usually because the memory is not compatible or failure result.
Override enable-Defaults loaded (current CMOS settings can't boot system, loaded BIOS defaults to start System).
reasons: you may be set in the BIOS is not suitable for your computer (like your memory can only run 100MHz but you just let it run 133MHz), then enter the BIOS setting adjustment.
Press TAB to show POST screen (press the TAB key you can switch the screen display)
reason: some OEM manufacturers to display their design to replace the BIOS default boot screen, which prompts to tell the user can press TAB to custom manufacturer of picture and BIOS switch default boot screen.
Resuming from disk,Press TAB to show POST screen (resuming from disk to boot, press TAB to display the post screen).
reason: some motherboards BIOS provides the Suspend to disk (suspend to disk) functions, when used to Suspend to disk to shutdown, then this message will be displayed at the next boot.
BIOS ROM checksum error-System halted (sum check BIOS code (checksum) found errors, so no post)
reason: this problem is usually because the BIOS code update as a result of incomplete, the solution flashed again burned out the motherboard BIOS.
HARD DISK initizlizing "Please wait a moment ..." (in your hard disk initialization (Initizlize))
cause: this message on a new hard disk, simply cannot see. But on the older hard drive, it moves more slowly, so you will see this message.
POST checking number of rings is defined?
POST post by alarm sound way to point out that the number of detected failures. Note: due to the current Board are mainly AWARD BIOS type company, AMI, PHOENIX companies (the AWARD has merged with PHOENIX), so that different types of BIOS, its self test self test error defined by the number of rings is inconsistent, so be sure to tell.