Crazy Computer

It might be overheating. Check that the fan is blowing and that the ducts are clear of dust. Also check the fan on the CPU.

A simple test is to open the computer box and set up a fan to blow air across the circuitry. See if that has any effect on the time it takes for the computer to shut down.

Hi friends

waht I want to say

1- u can chek the battary on mother bourd

2- u can chek the virus

3- u can monitor the heat of processor

Best Regards

Possible reason

1. Check for over heating

2. check whether your RAM is ok if any bank in the RAM module is damaged then this happens

3 . check for virus

4. check in the scheduled manager that any program is running when your computer is booting that makes your computer to shut down

5 . run chkdsk to see if any system files are corrupted

6 . finally check SMP power continuity if there is any failure in the output of smps.

7 . check your UPS too........

..........

Does it happen in safe mode as well? If not it would point towards a software/driver issue calling for a reboot. If it does still happen, it would suggest a hardware issue as covered in the earlier posts.

Greetings,

I had the same problem several months ago. Over time it got worse and worse. It got to the point when I booted up, it would just keep rebooting. I got error messages referencing bad RAM.

So I took the side panel off and the RAM chips were caked with dust and the dust was bridging the contacts. I blew them bad boys off, and badabeem, everything works just great!

Try a little house work!

drdave

So fare everything that has been said is pretty much spot on but there are a couple of other thing that I would include in the list.

· Mains Power Fluctuations Somebody else mentioned a fault in the uninterruptible power supply UPS and this can be a cause, provide you are using one. If you are not using one fluctuations in the mains supply voltage can cause problems like this. This sort of problem is difficult to test for and the only simple solution is to take the machine to another location and test it there.

· Power Supply Faults Intermittent faults in the power supply can cause problems like this as well. These are difficult to find but an initial test of the output voltages with a multimeter for both the correct DC voltages and for any AC ripple on the DC voltages is a good place to start. Ultimately the only way to prove that this is the cause is to replace the power supply and see it the problem goes away.

· Overheating As others have stated overheating can cause the system to rest and reboot. One of the big flaws in the design of nearly every PC is the way they are cooled. They nearly all suck the hot air out of the inside. This turns you PC into a vacuum cleaner and over time clogs the inside up with dust, hair, cigarette ash, dead skin and a whole host of other things that float around in the air. This is fairly easy to fix by cleaning the inside of your PC with a vacuum cleaner and a small brush. Please note that whenever working inside you PC take Static Discharge Precautions.

The overheating is by far the most probable cause of your problems so start with that first.

Static Discharge Precautions Modern electronics is highly sensitive to static discharges and static electricity, at levels way to low for you to detect, can severely damage the electronics. The processor chip in your computer uses field effect transistors that use very low voltages to switch on. Hit them with the several thousand volts that is normally present on your body and they get fried. You may not even need to touch the board as just passing a highly charged hand nearby can sometimes damage the electronics.

The best thing to do is to use a proper antistatic wrist strap and earthing cable to connect yourself to the chassis of the machine while working inside the PC.

If you do not have a proper antistatic wrist strap the next best thing is to make sure that one hand is always touching the chassis of the computer whenever you are working inside the machine. This will ensure the machine and you are always at the same potential and minimize the risk of damage.

Safety Precautions Whenever working on the inside, of any device, that uses mains voltage, be sure you have turned the device off and disconnected the power lead. It is also a good idea to leave it turned of for a few minutes, before opening the case. This gives any capacitors time to discharge.

Also check the connection in the plug. and check cable.

I once had a cracked mother board with similar symptoms. Did anybody install a new card recently?

also don't forget to check whether your computer restarts because of usage of any wireless devices like mobile phones, cordless phones, microwave oven, TV, etc. this happened one in my college computer laboratory . whenever some cell phones got incoming calls or outgoing or MSG then few of our system got restarted. i don't know the reason why. but it happened.

the same happens while using microwave oven or switching heavy load.....

"also don't forget to check whether your computer restarts because of usage of any wireless devices like mobile phones, cordless phones, microwave oven"

"i don't know the reason why. but it happened."

This is called Radio Frequency Interference RFI and affects cheaper models more than the more expensive and better constructed systems. It can also compounded by poorly earth power outlets.

Domestic power outlets have a safety earth and this may not be adequate. As computers and mobile phones have become more sophisticated over time the frequency that they operate internally at has been steadily rising. As a result RFI is becoming more and more of a problem and earthing systems that have worked in the past may unexpectedly become inadequate. Proper earthing of high frequency equipment is too complex a problem to cover in a single post so if anybody wishes to know more about this contact me via the CR4 mail system and I will point you in the right direction.

"the same happens while using microwave oven or switching heavy load....."

If you have a microwave oven that is causing RFI then you must immediately stop using the microwave oven as it is leaking and can cause serious health problems. Microwave radiation leaking from an oven can, amongst other things, cause the lenses in your eyes to become opaque. This is called a cataract an the only solution is to remove the lens and replace it with a synthetic one.

If the problem only occurs when the oven is started or when heavy loads are connected to the mains then this is a different problem all together. What is happening here are transient voltages on the mains causing instabilities in the power supply in the PC. Again the quality of the PC will determine the susceptibility of the unit to transient voltages. Mains voltage transient problems can also be compounded by poor earthing of both the PC and the device that is causing the transient.

Mains voltage transients can be complex and difficult problems and to properly analyze them you need some very expensive and specialized equipment. Without this specialized equipment there is no way to know for sure but if you take your PC somewhere else and it runs OK there then there is a fairly good chance that it is some sort of voltage transient that is causing your problems.

Sorry man please what do you mean by transient?

regards

Hi nganpet,

Sorry man please what do you mean by transient?

There is no need to apologize, I would prefer people ask rather than continue on not understanding.

Voltage transients is a general term that is use to describe fluctuations in the mains voltages. They are called transients as the voltage is in a state of change or transiting to a new stable level. They can be caused by a variety of things but the most common causes are:

• Switching of Heavy Loads When large loads are connected or disconnected to the mains there is a short delay before the system can compensate for the change in load. As a result there will be a period when the voltage can increase or decrease above or below the normal level until the system stabilizes at the new voltage. This is what is happening when you see the lights dim or brighten for a couple of seconds.
• Inductive Spikes When inductive loads. Like the ballast in fluorescent lights and large electric motors are turned off, you can generate a high voltage spike. This is similar to what happens in the ignition coil of a car and the spike can be quiet large. This spike is then transmitted along the power lines to all the users in the vicinity. These spikes can then be transmitted directly to the system through the power or by induction to cables that run near power cables.
• Lightning When lightning strikes it causes very high currents to flow in the ground around the point it strikes. These currents can then induce a spike in the mains supply that is then transmitted over a considerable distance by the transmission system A direct lightning strike to power lines may also cause large voltage spikes. The important thing to know is that the lightning doesn't need to hit the power lines directly to cause a problem and that the induced spikes can be seen a considerable distance from the point of the strike.

There are other causes but these are the most frequent source of fluctuations or transients of the mains supply voltage.

thanks masu, your explanation for my question regarding wireless device operation and transient was excellent.

.

Thanks His Excellence