Question about EliteGroup P4M800PRO-M478 Motherboard

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Processor My processor cannot switch on after power failure.What could be the problem?

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I don't hear the fan come on at all.

Is there a solution?

Posted on May 12, 2008

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I presume you mean "automatically switch BACK on after a power failure". As in, power goes off on local AC grid, computer of course, goes cold, power comes back on, and you want PC to resume (reboot) automatically. If that is what you are asking, here are the possibilities:

1. If you have a "momentary on" start button (as most newer model cases have) you cannot do this simply by leaving switch "on" because it does not remain in continuity. It must be pressed manually every time the computer shuts down.

2. Your BIOS may be the best and simplest means of getting what you want. In BIOS, you will find a setting that allows the computer to restart after every power outage.

3. There is also a software-related setting available in Start Menu/Settings/Control Panel/System. Select "Advanced" tab, then "Startup and Recovery" and make sure "Automatic Reboot" is checked.

4. Now, all that being said, just to answer your question as I presume you meant it, I want to advise you this is all a bad idea (and in fact, it is the reason most newer PC start buttons are "momentary on" as indicated in number one above). Why is this such a bad idea?

When the power goes off, there will always be a big voltage spike, and another even BIGGER spike when it comes back on. Worse, if the power went off on your grid due to an overload, when it comes back on it may either "machine gun" (off/on several times from heavy load, each one with a larger voltage spike) or come on low, below voltage tolerance, fluctuate wildly, and slowly reach proper voltage levels. All of these events are VERY hazardous for your PC, and even with a median surge suppressor, any of these events can damage your PC power supply AND/OR your CPU or other components! It would be far wiser to buy a "UPS" (uninterruptable power supply) which is a unit that plugs in between your AC wall current and your PC. The UPS has a battery and power inverter inside, that changes the 12VDC battery power to 120VAC (or 220VAC if you are outside USA). This device remains vigilant 24 hrs a day, and lets your computer continue running even when the power is off to your house/neighborhood. Of course, it has time limits, can only sustain this power for a specified number of minutes or hours depending on the size/price of the UPS you buy, but this is sufficient time to cover most power outages.

Posted on Feb 13, 2008

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Be more specific. Is the PSU powers on, Do you have any LED's on, any fans spinning, any sounds out.

Posted on Feb 12, 2008

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The LED in my motherboard is on, but if i turn on the switch, their is no response. the power connection is correct. but it doesn't work

Try swapping the power button connection with the reset button connection. Then to turn on your computer you will need to press the reset button. If that works you have a faulty power button. Otherwise try using a different PSU. One that you know works. If that doesn't help the motherboard will have to be replaced.

Jun 18, 2011 | ASUS P5VD2-VM SE - Motherboard - micro ATX...

4 Answers

Five long beeps at a range of five seconds then, repeats

Five long beeps for a modern motherboards indicates a processor failure. If you wish to remove the processor and re-seat it (reconnect it to see if it begins to work again) make sure to get some thermal compound to put between the CPU chip and the heatsink. More info at:
POST AMI BIOS beep codes
  • 1 - Memory refresh timer error
  • 2 - Parity error in base memory (first 64 KiB block)
  • 3 - Base memory read/write test error
  • 4 - Mother board timer not operational (check all PSU to MB connectors seated)
  • 5 - Processor failure
  • 6 - 8042 Gate A20 test error (cannot switch to protected mode)
  • 7 - General exception error (processor exception interrupt error)
  • 8 - Display memory error (system video adapter)
  • 9 - AMI BIOS ROM checksum error
  • 10 - CMOS shutdown register read/write error
  • 11 - Cache memory test failed
  • 12 - Mother board does not detect a RAM module (continuous beeping)
Source: Wikipedia

Feb 28, 2011 | Computers & Internet

1 Answer

Hello, after installing processor, memory module and grahics card, the MB AOpen AK77-333 makes a couple of CPU fan revolutions after it is powered-on and then stops. Thank you for the reply,

That old puppy may have bad Electrolytic Capacitors.

(Radial Aluminum Electrolytic Capacitor)

Specifically the ones in the motherboard voltage regulator circuit, and more specific the ones used for the voltage regulation to the Processor.

(AOpen AK77-333 details,

Go to the bottom of the page to click to the additional information. 7 Pages)

Visual signs of capacitor failure,

{ Back in the day there was espionage at a large capacitor company.
An employee tried to abscond with an Electrolytic Capacitor paste formula.
The company got a heads up before this transpired, and she was given a bogus formula.

The formula didn't have the correct chemical composition, and would develop gas after a time period.
The gas (Hydrogen Gas) expands in the capacitor, and causes seals to be compromised, where the paste is then pushed out.
So much paste loss, and the capacitor can operate in a weakened state.
Too much paste loss, and the capacitor fails

The AOpen motherboards were made in this time period, and not to slam AOpen, but they grabbed up on cheap quality capacitors. Guess which ones they got? AOpen is now out of business.

There were 1000's upon 1000's of these Electrolytic Capacitors made, and they are STILL plaguing electronic components today.

Just a heads up if you find problems with other electronic devices, or components also.
(I replaced some in a Modem. Modem has worked great for 2 years now) }

Problem is that Electrolytic Capacitors do not always show visual signs of failure. The paste can also dry up inside, and no outward visual sign will be apparent.


(Starts at 0:04)


It could also be a bad Power Supply with a weak voltage power rail.
Enough power to light LED lights, and maybe spin fans a few times, but not enough power to turn the Processor on.

1) ALL of the LED light on at once use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use 51 to 125 watts of power.
Depends on what processor it is.

AOpen AK77-333?

Socket A (Also known as Socket 462) processor socket. Uses AMD processors with up to a 266MegaHertz Front Side Bus. (266MHz FSB)

AMD Athlon , or Athlon XP, or Duron.

Dec 10, 2010 | AOpen AK77-333 Motherboard

1 Answer

Hi would like to know in which order the components start on a intel extreme dx 58S0 motherboard,eg 1.processor 2.maybe ram ,then keyboard ect.

1) Installing? I don't think this is your problem/question, but............

Processor on the motherboard, Thermal paste on the top of the Processor, Heatsink/Fan combo on on the top of the Processor.
Ram Memory Installed.
Motherboard installed in case.
Graphics card installed, and all other add-in cards.
Optical and card reader drives installed.
Power Supply installed, power cables attached.

2) Are you are looking at the order in which BIOS recognizes the devices?

You press the Power On button.
The plastic Power On button assembly presses against the Power On switch. The Power On switch is located inside the plastic Power On button assembly.

Example of a typical ATX power on switch,

When the Power Supply is plugged into power, there is a constant 5 Volts inside the Power Supply.
The 5 Volt Standby power.

Pressing the Power On switch closes the switch temporarily.
(The Power On switch is a Momentary Contact Switch)
This redirects the 5 Volt Standby power to a different circuit in the Power Supply.
The Soft Power On circuit. (PS_ON)

The Power Supply comes on.
The first chipset to receive power is the BIOS chipset.
The BIOS program is initialized.

BIOS looks to see what devices are installed, both on the motherboard, and external peripheral devices.
BIOS then does a Ram Memory count, and turns the Processor on.
Finally BIOS hands the computer over to the Operating System.

3) This is a motherboard diagram.
CPU stands for Central Processing Unit.
Another name is Microprocessor, or simply Processor for short.

Nov 15, 2010 | Intel Extreme DP55WG (BLKDP55WGPAK10)...

2 Answers

My board does not turn on and its beeping. Ive counted 7 beeps. i tried replacing the memory with known good ones but still the beeping persist.

MSI states that 7 beeps means "Virtual mode exception error "

Explanation: Virtual mode is one of the different modes that the processor can run in. The system is reporting an error when testing this mode.
Diagnosis: There is a problem related to the processor or motherboard. Note that this doesn't mean that the processor is necessarily dead, since the system won't boot at all with a dead processor.

Not knowing the price of either your processor or the board it is hard to say what to do for the best

Good luck
AMI Beep Code Deep Code Description 1 short DRAMS refresh failure 2 short Parity circuit failure 3 short Base 64k RAM failure 4 short System timer failure 5 short Process failure 6 short Keyboard controller Gate A20 error 7 short Virtual mode exception error 8 short Display memory Read/Write test failure 9 short ROM BIOS checksum failure 10 short CMOS shutdown Read/Write error 11 short Cache Memory error 1 long, 3 short Conventional/Extended memory failure 1 long, 8 short Display/Retrace test failed AWARD Beep Code Deep Code Description 1 Long, 2 Short A video error has occurred and the BIOS cannot intialize the video screen to display any additional information

Jun 19, 2010 | MSI K9N6PGM2-V Motherboard

1 Answer

Computer is dead

Most of the time it's power supply failure.

1.A lot of computer owners fail to clean the inside of their computer, plus the power supply out, on a regular basis. I find this occurrence at my shop quite a lot.
Unplugging the computer from power, observing anti-static guidelines, and using a can of compressed air for computers would have prevented this.

Power supply's have a fan for cooling, as well as heatsink's inside. When these components collect dirt, dust, hair, and other foreign objects, the cooling capacity drops tremendously.
Heat = Wasted Energy
The power supply struggles to keep up with the demand of power needed, and eventually components inside it fail.

2.Most power supply's installed in a pre-built computer, are of a low grade of quality. (MOST. Generally pre-built computers manufactured in the last two years, have upgraded the quality of their power supply's, but not all of them)

Saves the computer manufacturer money. These power supply's have low quality components. Gauge of wire used is smaller than it should be, Electrolytic Capacitors are of an inferior grade, transformers are cheaply made, and the rectifier bridge is cheaply constructed, are a few examples.

3.Computers that are built by the owner, and are not pre-built, may have a cheap, or underrated power supply installed. You really have to check out reviews for power supply's on the internet, to see what quality it has. However there are some websites, that 'pump up' the review to stay in good standing with the power supply manufacturer. Generally, if the power supply price is cheap, so is the quality.

There are two other things to look at.
It may be the Power On switch that is behind the Power On button. These can go out.

It could be the motherboard. Most of the time it is Electrolytic Capacitors that are the 'weakest link'. Specifically the one's that surround the processor. These 'Caps' are Voltage Regulators for the processor. If even One is bad, the processor will not work.
No processor, No computer.

How to know if it's the power supply? Use a known, good, and compatible power supply for a test. [Compatible being that the power supply has the required power cables for the motherboard, and enough Wattage]

How to know if there are bad Electrolytic Capacitors on the motherboard?
This website has information, plus photos of bad capacitors,

Sep 14, 2009 | Abit AV8 Motherboard

1 Answer

Gigabyte Prosessor Display Problem.

It may be an overheating issue. If so the processor is overheating, and turns off. This is a Fail Safe feature that's built-in. Keeps the processor from burning up. (The BIOS program turns the processor off, if the Negative value is not met for the processor)

Why is the processor overheating? Let's look at some things that can cause this.
1.The processor fan is not turning, or isn't turning as fast as it should.
Solution? Replace the processor fan. (RPM's are too low)

2.In-between the processor's top case, and the bottom of the heatsink, is Thermal Paste. Some call it Thermal Grease.
If this has dried out, it won't transfer the heat from the processor to the heatsink. The heat won't be blown away from the heatsink, because there is not heat.
Solution? Replace the thermal paste.

(There is also a thing called a Thermal Pad. These are usually White in color. These things are Junk! If you have one, remove it, {You may have to scrape glue residue off also}, and throw it away.
Clean the top of the processor case, and the bottom of the heatsink. Apply new, fresh, thermal paste)

3.The computer unit is dirty inside. The dirt/dust, etc, clogs the cooling system, and the hardware inside heats up. Processor included.
Solution? Buy a can of compressed air for computers. (Attach the plastic 'straw') Clean the heatsink, and fan. Clean out the inside of the computer also. Plus clean out the power supply.

There are two other issues also. I deal with these a lot in my computer shop.
The main issue of computer failure is power supply failure. It ranks at 70%. Electrolytic Capacitors start failing in the power supply. These 'Caps' make a weak voltage power rail, or rails.

Second issue is failing Electrolytic Capacitors on the motherboard.
The ones surrounding the processor, specifically. These 'Caps' are Voltage Regulators for the processor.

When capacitors inside the computer start failing, all kinds of issues will come up, that mimic software issues.

A dirty computer is one reason these 'Caps' fail before they should.
The second reason is Capacitor Plague

Apr 02, 2009 | Intel Motherboard

1 Answer

When cpu switch on processor & power supply fan runs, no display

if you have swolen capacitors you are on the road the failure

buy a new mb and save yourself some time.

hope this helps

Dec 30, 2008 | EliteGroup P4IBMS Motherboard

1 Answer

Safety of mother board and processor

Connect any good cabinet which involves a good power supply comprising of smps (Switching Mode Power Supply) again it also consists of four cables yellow (12v), Red cable (5v) and other two black wires of ground check the voltages with a voltmeter then you can avoid burning or failure of product .
Note : Ask your electrician to provide better earthing to your computer

Feb 19, 2008 | Intel Motherboard

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