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System not booting

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July 25, 2011 6:33:17 PM

Hi guys!
I'm experiencing a problem with my one year old PC.It all started a few days ago.While loading Windows,the system just kept on freezing.I tried everything I knew but noting worked.A few hours later I tried to turn it on again and this time it didn't even start.I called the a.s.s. department and guy guy came to my home and checked everything.He says that it's an issue with the motherboard and that it will take atleast 2 months to solve it because they will have to send it to Intel for repairing it as it is under warranty.Now,I find it very difficult to believe it.Do you guys think that it's actually a problem with the mobo?I need help as I have to do something very quickly.I think a faulty RAM can also be the culprit here.I don't want to wait for 2 months.Please help me friends.
Thanks in advance.

More about : system booting

July 25, 2011 6:44:37 PM

Your really kind of stuck because if you do anything that involves taking the components out your going to void your warranty. Usually with a PC under warranty they are pretty specific about the user cracking the case. Alway's results in loss of warranty coverage. So consider that before pulling parts or even opening the box.
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July 25, 2011 7:56:27 PM

So what should I do now?Wait for 2 months?
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July 25, 2011 8:50:09 PM

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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July 25, 2011 9:40:59 PM

pacific_1 said:
So what should I do now?Wait for 2 months?



That's your call :)  I just wanted you to know that pulling the components "may" void the warranty if your machine is covered as stated in your post. That way you can find out (or not) and make an informed decision about whether to go ahead and remove parts from the box.
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