Question about MSI MBOX KM4M-L (ms-6734bb-040) Barebone

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No power turn on but nothing happens power supply tested good

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Did you do any changes to your computer power pins?
did you connect all the needed wires to your motherboard?


Posted on Jan 31, 2009

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Posted on Jan 02, 2017

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Tell me aboout boot sequence in bios setup


The system BIOS is what starts the computer running when you turn it on. The following are the steps that a typical boot sequence involves. Of course this will vary by the manufacturer of your hardware, BIOS, etc., and especially by what peripherals you have in the PC. Here is what generally happens when you turn on your system power:
The internal power supply turns on and initializes. The power supply takes some time until it can generate reliable power for the rest of the computer, and having it turn on prematurely could potentially lead to damage. Therefore, the chipset will generate a reset signal to the processor (the same as if you held the reset button down for a while on your case) until it receives the Power Good signal from the power supply.

When the reset button is released, the processor will be ready to start executing. When the processor first starts up, it is suffering from amnesia; there is nothing at all in the memory to execute. Of course processor makers know this will happen, so they pre-program the processor to always look at the same place in the system BIOS ROM for the start of the BIOS boot program. This is normally location FFFF0h, right at the end of the system memory. They put it there so that the size of the ROM can be changed without creating compatibility problems. Since there are only 16 bytes left from there to the end of conventional memory, this location just contains a "jump" instruction telling the processor where to go to find the real BIOS startup program.
The BIOS performs the power-on self test (POST). If there are any fatal errors, the boot process stops. POST beep codes can be found in this area of the Troubleshooting Expert.
The BIOS looks for the video card. In particular, it looks for the video card's built in BIOS program and runs it. This BIOS is normally found at location C000h in memory. The system BIOS executes the video card BIOS, which initializes the video card. Most modern cards will display information on the screen about the video card. (This is why on a modern PC you usually see something on the screen about the video card before you see the messages from the system BIOS itself).
The BIOS then looks for other devices' ROMs to see if any of them have BIOSes. Normally, the IDE/ATA hard disk BIOS will be found at C8000h and executed. If any other device BIOSes are found, they are executed as well.
The BIOS displays its startup screen.
The BIOS does more tests on the system, including the memory count-up test which you see on the screen. The BIOS will generally display a text error message on the screen if it encounters an error at this point; these error messages and their explanations can be found in this part of the Troubleshooting Expert.
The BIOS performs a "system inventory" of sorts, doing more tests to determine what sort of hardware is in the system. Modern BIOSes have many automatic settings and will determine memory timing (for example) based on what kind of memory it finds. Many BIOSes can also dynamically set hard drive parameters and access modes, and will determine these at roughly this time. Some will display a message on the screen for each drive they detect and configure this way. The BIOS will also now search for and label logical devices (COM and LPT ports).
If the BIOS supports the Plug and Play standard, it will detect and configure Plug and Play devices at this time and display a message on the screen for each one it finds. See here for more details on how PnP detects devices and assigns resources.
The BIOS will display a summary screen about your system's configuration. Checking this page of data can be helpful in diagnosing setup problems, although it can be hard to see because sometimes it flashes on the screen very quickly before scrolling off the top.
The BIOS begins the search for a drive to boot from. Most modern BIOSes contain a setting that controls if the system should first try to boot from the floppy disk (A:) or first try the hard disk (C:). Some BIOSes will even let you boot from your CD-ROM drive or other devices, depending on the boot sequence BIOS setting.
Having identified its target boot drive, the BIOS looks for boot information to start the operating system boot process. If it is searching a hard disk, it looks for a master boot record at cylinder 0, head 0, sector 1 (the first sector on the disk); if it is searching a floppy disk, it looks at the same address on the floppy disk for a volume boot sector.
If it finds what it is looking for, the BIOS starts the process of booting the operating system, using the information in the boot sector. At this point, the code in the boot sector takes over from the BIOS. The DOS boot process is described in detail here. If the first device that the system tries (floppy, hard disk, etc.) is not found, the BIOS will then try the next device in the boot sequence, and continue until it finds a bootable device.
If no boot device at all can be found, the system will normally display an error message and then freeze up the system. What the error message is depends entirely on the BIOS, and can be anything from the rather clear "No boot device available" to the very cryptic "NO ROM BASIC - SYSTEM HALTED". This will also happen if you have a bootable hard disk partition but forget to set it active.

Dec 15, 2010 | HP Computers & Internet

1 Answer

DOES NOT POWER ON. PLUG IN AND HIT POWER BUTTON, NOTHING HAPPENS.


sounds like a bad power supply you can test it if you have a pc power supply tester,or have it tested at your local pc store.also check to see if its still under warrenty,that way you could get the work done for free at an authorized repair center.

Aug 23, 2010 | Shuttle XPC SK22G2 Barebone

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Need some help please. Shuttle sn27p2 nearly 4 years old. Problem: Green led on mother board on, pressing the power switch and nothing happens at all, that?s no fans, no light on power switch nothing....


Your symptoms make me believe that you're out of Power Supply. Does this happen all of a sudden?

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Jun 22, 2010 | Shuttle XPC SN27P2 Barebone

1 Answer

PSU hangs the system: can't turn on; turns of in 30 min


either the power supply needs replaced or there is a short on the board...

pull the mb and guts of the system out of the chassis

connect the power supply with one cpu and one stick of memory for testing.. no add-in cards installed

then test the power capabilities..

if the system works out of the chassis.. ( alot of work to do ...understood )then there is short to the chassis of the from the motherboard

i really think the power supply is the issue though

Sep 29, 2009 | Computers & Internet

1 Answer

No boot up.


Power supply is easier to troubleshoot my local pc shop has used ones for $5 or if you have one laying around make sure you have one with the proper mobo connector 24pin will sometimes fit 20 pin as long as there are no transistors to close to plug just turn pc off unplug all drives and mobo plug in good supply and turn on if it works thats the problem if not probably mobo

Apr 10, 2009 | Shuttle SK43G (tsk43g) Barebone

1 Answer

Aopen barebone XC Cube does not start


Due to the fact that the clock is working on the front panel I would say you at least have some power
1. If your power supply has 110/220 selection on the back make sure that is set to the appropriate
setting.
2. Check to make sure the power is attached to the board right due to you changing the power supply
make sure that the if the board requires the additional 4 pin and or any others from the power supply
that they also are plugged into the mother board!
3. Check to make sure your switches from the power switch/ reset switch / hd lite / etc are all
properly in the right spot and in the right direction observing positive and negative orientation.

If all these are done and still nothing happens and the fan on the power supply is working you still can due further testing on the power supply using a multimeter and checking that the connectors to the board are functioning properly, if they are and you have done all the above things two possibilities remain, one your processor is installed wrong or not working or as you thought, your board could be malfunctioning..

I forgot to mention that you also have to make sure that the fan's are also plugged into the board properly (cpu fan, case fan, etc) this can also disable your computer from starting!

Note: I am going by the information above, if your computer made a sound or anything else please let me know!

Hope this helps

Dec 08, 2008 | Computers & Internet

1 Answer

Shuttle X PC - HD + Power LEDs briefly illuminate, no boot.


It sounds like you have a bad power supply. It will store up a very small amount of energy (enough to run some LED lights) but not enough to power up the system. That's where I would look. If that is not the problem, then I would look to the capacitors on your motherboard. Good Luck!

Dec 02, 2008 | Shuttle Computers & Internet

2 Answers

Power up problem


power supply issue. replace power supply

Jan 08, 2008 | Iwill ZMAX-AP Barebone

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