2-1-2-3 Check ROM copyright notice.
2-1-2-4 Initialize manager for PCI Options ROMs.
2-1-3-1 Check video configuration against CMOS.
2-1-3-2 Initialize PCI bus and devices.
2-1-3-3 Initialize all video adapters in system.
2-1-4-1 Shadow video BIOS ROM.
2-1-4-3 Display copyright notice.
2-2-1-1 Display CPU type and speed.
2-2-1-3 Test keyboard.
2-2-2-1 Set key click if enabled.
2-2-2-3 56 Enable keyboard.
2-2-3-1 Test for unexpected interrupts.
2-2-3-3 Display prompt "Press F2 to enter SETUP".
2-2-4-1 Test RAM between 512 and 640k.
2-3-1-1 Test expanded memory.
2-3-1-3 Test extended memory address lines.
2-3-2-1 Jump to UserPatch1.
2-3-2-3 Configure advanced cache registers.
2-3-3-1 Enable external and CPU caches.
2-3-3-3 Display external cache size.
2-3-4-1 Display shadow message.
2-3-4-3 Display non-disposable segments.
2-4-1-1 Display error messages.
2-4-1-3 Check for configuration errors.
2-4-2-1 Test real-time clock.
2-4-2-3 Check for keyboard errors
2-4-4-1 Set up hardware interrupts vectors.
2-4-4-3 Test coprocessor if present.
3-1-1-1 Disable onboard I/O ports.
3-1-1-3 Detect and install external RS232 ports.
3-1-2-1 Detect and install external parallel ports.
3-1-2-3 Re-initialize onboard I/O ports.
3-1-3-1 Initialize BIOS Data Area.
3-1-3-3 Initialize Extended BIOS Data Area.
3-1-4-1 Initialize floppy controller.
3-2-1-1 Initialize hard-disk controller.
3-2-1-2 Initialize local-bus hard-disk controller.
3-2-1-3 Jump to UserPatch2.
3-2-2-1 Disable A20 address line.
3-2-2-3 Clear huge ES segment register.
3-2-3-1 Search for option ROMs.
3-2-3-3 Shadow option ROMs.
3-2-4-1 Set up Power Management.
3-2-4-3 Enable hardware interrupts.
3-3-1-1 Set time of day.
3-3-1-3 Check key lock.
3-3-3-1 Erase F2 prompt.
3-3-3-3 Scan for F2 key stroke.
3-3-4-1 Enter SETUP.
3-3-4-3 Clear in-POST flag.
3-4-1-1 Check for errors
3-4-1-3 POST done--prepare to boot operating system.
3-4-2-1 One beep.
3-4-2-3 Check password (optional).
3-4-3-1 Clear global descriptor table.
3-4-4-1 Clear parity checkers.
3-4-4-3 Clear screen (optional).
3-4-4-4 Check virus and backup reminders.
4-1-1-1 Try to boot with INT 19.
4-2-1-1 Interrupt handler error.
4-2-1-3 Unknown interrupt error.
4-2-2-1 Pending interrupt error.
4-2-2-3 Initialize option ROM error.
4-2-3-1 Shutdown error.
4-2-3-3 Extended Block Move.
4-2-4-1 Shutdown 10 error.
4-3-1-3 Initialize the chipset.
4-3-1-4 Initialize refresh counter.
4-3-2-1 Check for Forced Flash.
4-3-2-2 Check HW status of ROM.
4-3-2-3 BIOS ROM is OK.
4-3-2-4 Do a complete RAM test.
4-3-3-1 Do OEM initialization.
4-3-3-2 Initialize interrupt controller.
4-3-3-3 Read in bootstrap code.
4-3-3-4 Initialize all vectors.
4-3-4-1 Boot the Flash program.
4-3-4-2 Initialize the boot device.
4-3-4-3 Boot code was read OK.
My computer does not start unless I restart it multiple times.
If a computer is able to successfully startup if it is restarted several times, it is likely that the computer is encountering one of the below issues.
Bad power supply or inadequate power supply
Bad hard disk drive
Other hardware issue
1.Bad power supply or inadequate power supply
-A bad, failing, or inadequate power supply is often the cause of this issue. If the hard disk drive is not getting enough power during the first time the computer starts, it will be unable to spin the hard disk platters fast enough to start the computer. However, if you restart the computer two, three, or more times, because the platters are already spinning, it is able to get the drive up to speed and able to boot off the drive.
-If you're encountering this issue after installing new hardware in the computer, it's also possible the power supply in the computer is not supplying adequate power to the computer. For most computers we recommend you have at the least a 300-watt power supply.
-Our first recommendation is to replace or replace and upgrade the power supply in the computer.
Bad hard disk drive
-This issue can also be caused by a failing or bad hard disk drive. Similar to the above issue, if there is a failure within the hard disk drive that is causing the disk platters to not spin up fast enough during the initial power up, you may also encounter this issue.
-If after replacing the power supply you continue to experience the same issue, it's likely that the hard disk drive is at fault and we suggest the hard disk drive be replaced.
Other hardware issue
-Although not as likely as the above two causes (bad power supply or hard drive), other hardware can potentially cause this issue to occur. Below are some other possibilities that may cause this issue.
-Replace the IDE/EIDE interface cable connected from the motherboard to the hard disk drive. If the cable is defective it could cause various issues with your hard disk drive.
-Finally, if the computer continues to exhibit the same issue after following all of the above steps, it's likely that the motherboard is defective and that it should be replaced.
No power or computer does not turn on.
No power from the computer can be caused by any of the below possibilities.
Connections not connected properly.
Bad power cable.
Incorrect power supply.
Bad power supply, power button, and/or power board or inverter.
If you are uncertain if the computer is turning on or not, this can be easily checked by locating any fans in the computer or visible from the outside of the computer. If these fans are spinning, the computer is receiving power and this document may not apply to your issue.
Connections not connected properly
-Verify that the power connection is connected properly to the wall and the back of the computer. If the connections appear to be connected properly, attempt to disconnect and reconnection both ends of the cable.
-If you have a power strip (surge protector) or switch used to turn everything on at once, temporarily disconnect the computer from that switch and connect that cable directly to the wall. This will help verify that the strip or switch is not bad.
-Verify that the outlet works by connecting a different component to that switch.
-If additional hardware has been recently added to the computer it is recommend that you temporarily disconnect that device or devices from the computer to verify they are not preventing your computer from turning on.
Bad Power cable
-Verify that the cable supplying your computer is not bad or damaged by using another power cable. If you have a standard CRT monitor, this cable can be used in place of the computer power cable.
-If you have a portable computer or laptop, when the cables are plugged into the laptop you should see a power light or battery charge light. If this light is seen, this is a good indication that the power cable is good.
Incorrect power supply
-If you are building your own computer or if the computer has never turned on since you purchased it, it is possible you are using a power supply that does not supply enough power and/or the incorrect type of power supply. Verify your power supply meets the requirements of your motherboard and processor.
If your computer is a laptop or portable computer that utilizes a battery for mobility it is possible that the battery may be causing your issue.
* If your computer powers on when the cable is connected to the portable computer but not when it is disconnected, we recommend you purchase a new battery.
* If your computer does not power on when the battery is connected and when the power cable / charger cable is connected, try removing the battery and seeing if the computer can power on with only the power cable connected. If no power is still received, skip to the final section.
Bad Power Supply, power button, and/or power board or inverter
If, after following the above sections, your computer still receives no power, it is likely that a hardware component in the computer has failed. It is most likely that the power supply has failed. If you do not plan on replacing the power supply yourself or if you have a portable computer, we recommend having the computer serviced by your computer manufacturer or a local computer repair shop.
If you have a desktop computer and plan on trying to repair the computer yourself, we recommend you replace the components in your computer in the below order.
First open the computer and verify the power connections. You may also wish to consider disconnecting the main power cable and reconnecting the power cable to make sure it has not become loose. Also verify the power button cable is correctly connected to the Motherboard.
Replace the power supply with a new power supply.
Replace the motherboard.
Written by: Computer Hope's free computer help
Organized by : Sylwester. S