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My computer problem.

Last response: in CPUs
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June 6, 2011 9:17:31 PM

Hi all.

I actually have 3 problems with my 3 year old pc, they might be related.

1. When I turn my computer on it randomly shuts down after 3 sec.
2. There´s sometimes a strange sound in the fan which blows the air out. The fan is always working though and then the sound goes away after few minutes :) 
3. I have been overclocking my processor from 3 Ghz to 3.5 Ghz for a year without any problems (E8400) Now everytime I shut my machine down the Bios seems to reset itself, so my speed goes a bit down. I already checked my battery, it´s showing 3.2 V on my meter.

I´m most concerned about the first problem :(  Any little help?

More about : computer problem

a c 172 à CPUs
June 6, 2011 9:49:11 PM

Full system specs?

Work systematically through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.
The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
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a c 81 à CPUs
June 6, 2011 10:01:04 PM

Yes, your full system specs are necessary. Here are some pre hunches though -

1. Suggests a failing/underpowered PSU.

2. Might be a case of PWM kicking in. The fan might be revving at full speed on startup. Then gradually revs down.

3. Set your DRAM profile to auto.
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a c 81 à CPUs
June 6, 2011 10:01:27 PM

Yes, your full system specs are necessary. Here are some pre hunches though -

1. Suggests a failing/underpowered PSU.

2. Might be a case of PWM kicking in. The fan might be revving at full speed on startup. Then gradually revs down.

3. Set your DRAM profile to auto.
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a b à CPUs
June 6, 2011 10:47:38 PM

Check temps. Is the inside of your case clean? Fans can get heavy dust build up. I have two large dogs and am also a smoker. I clean my system thoroughly at least once a month, and do notice moderate temp. drops each time.
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June 6, 2011 10:52:53 PM

Here are my specs.

Windows 7 Ultimate 32-bit
System Model: P35-DS3L
Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz (2 CPUs), ~3.5GHz
Memory: 4gb ddr2 RAM
Available OS Memory: 3582MB RAM
Page File: 1783MB used, 5380MB available
ATI Radeon HD 5850
500 gb hard disk

DRAM profile to auto?
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June 7, 2011 12:11:15 AM

Does the machine shutdown at 3.0 GHz?
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a b à CPUs
June 7, 2011 12:12:48 AM

Jim_L9 said:
Does the machine shutdown at 3.0 GHz?

Good point. Also, check Vcore voltage in BIOS.
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June 7, 2011 12:31:28 AM

Yes it also shuts down at 3.0 Ghz. Overclocking it to 3.5 is easy and it´s very stable, never had a problem. I´m just tired of going onto the bios and setting it to 3.5 every time I turn my machine off. Maybe I should update my bios?
Anyway I don´t have any worries about the fan, it´s a bit loud sometimes, it´s probably just dust even though I clean my case once a month. Also about the shutdown, that might be the button itself, it´s very loose, I´m gonna take a better look at that.
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June 7, 2011 12:58:29 AM

I think I found a fix for the bios reset. This is a usual problem for these motherboards.

http://forums.anandtech.com/showthread.php?t=121095&pag...

The solution is simple. Go into the bios, do your thing, go back to the start point and press F11 to make a Profile, safe it, press F10 and exit.


Really hope it works :) 
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