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Solve : computer turns itself off and on?

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I hope this is the right area, if not i apologize.

my husbands computer turns itself on and off, in one night i heard it go off and on 18 times before i went to bed. at this point it is not usable because it wont stay on long enough to do more than show the desktop then turn itself off, then on again to just show the desktop, then off.
it is very frustrating, we bought both computers the same DAY. same type, the warranty has expired. he took it in to Major Geeks, after 389.00 and 3 weeks they put heat paste on it & said it was fixed, it worked for 1 week then same problems again. Please, can anyone help us?
Welcome to CH.
Sorry to hear of you unhappy experience.
There are a number of experts here who will spend time to help find your propblem and not charge you a dime. Just be patient, this is a forum, not a chat room. It may take a day or two for the best experts to see this post.

First guess, at this point, is the heat sink came loose again.
But there are other things that may cause this behavior.
A failing poser supply. A failing Video card. A failing DVD-drive.

Knowing the make and model you you computer would help a lot.
We scan do a search and maybe find others who have had problems like that.

Can you get the thing to run for ten minuets at a time?
Can you try to put a big fan, a desk fan, behind the computer and trty to keep it cool?
I have a very good lady friend who did the fan in back thing worked for her. But she knew that was not quite right. And she knows little about computers. Anyway, she took it to a shop and they could not figure it out! So she got another computer and give the trouble to me. And, of course, I fixed i!
HELLO,
Thank you for responding.
The computer is a Dell Inspiron 530, its about 1 and 1/2 years old. Every once in a while it will stay on for approx. 2 or 3 minutes. We took both side covers off in hopes it would help with the cooling, and we bought the heat paste stuff. My husband knows "some" stuff about computers, but not how to repair or diagnose them. I am computer illiterate, all I know how to do is turn it on and play WOW with it. So I apologize in advance for asking repeatedly "What??"
We actually did try a small fan blowing on it after we took the sides off, hasnt helped much.
I called 5 different computer repair shops (after Major Geeks), told them the problem, they said "you have a Dell and its the processor". I called Dell to get a new one and wonder of wonders the one for my computer is no longer available.
I am frustrated to say the least. I am really hoping someone here can offer help.
thank you.Quote

he took it in to Major Geeks
Do you mean the Geek Squad?

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we bought the heat paste stuff. My husband knows "some" stuff about computers, but not how to repair or diagnose them.
So, did he do anything with the heat paste?
This post is being done with speech recognition software. Some of the grammar and vocabulary may seem strange.
Here are some additional suggestions. With the case open you can obviously see if the fan on top of the CPU is running. I am not familiar with the inside of this particular computer. Some computers do not cool better with the side panels off. Here are some other steps that you might want to take before you invest any money.
With the power completely off, and I mean absolutely unplugged, disconnect the power and data cable to the floppy drive also disconnect the power and data cable to the CD-ROM drive. There is a small chance that you either one of these may have a short circuit. Not likely, but very easy to check before you do anything else. You should be able to get the computer to boot up even without the floppy drive, although it may give you an error message because the floppy is not there.
Now if after that computer stays on for more than 10 minutes at a time this would lead us to believe it was the floppy or the CD-ROM drive.
.Here's the next step. Again with the power all, we hook back up the floppy drive and we reboot again and while the machine is on we tried to prepare a floppy drive that would be bootable. Your husband should know what I mean you have to stick to light disc into the floppy and format it as a system floppy. If you can't do that, never mind will just use whatever floppy disk you have laying around.
This time we are going to disconnect only the hard drive and this CD-ROM drive but leaves the floppy drive connected stick a disk into the floppy drive and try to see if the computer will boot up. It may boot up with some kind of error message such as NTLDR missing. Don't worry about the air message, we just want to see it at least tries to boot the floppy. At this point the computer should just sit there waiting for someone to replace the floppy disc. So let it sit there for while and see if it does anything more. Letting it sit there for several minutes should not do any harm to anything. Without the CD-ROM drive and the hard drive connected, the power consumption goes down and the power supply is less likely to fold over. The term means the power supply tries to protect itself from a short circuit.
Now the next step after this, that is if this does not identify the problem, is to try a different memory stick in the computer. Possibly you could swap a memory stick out of the other computer and see how it works in this computer. Once in a while it is a memory stick that shorts out the system. Not likely, but easy thing to check. And be very, very careful when you put the memory chip in make sure the snow dust or dirt on the pans and of course you will avoid touching the pans directly with your hands if you have to clean the pants off of something try a small cloth that has been dampened with a little bit of alcohol. Do not use a cotton swab, Italy's fibers on the pin connectors.
The above are the general procedures that are in a qualified technician would use to try to isolate the problem. Often times the above procedures do not produce an immediate answer. But they are rather simple procedures to perform and should be done before engaging in more DIFFICULT diagnostic methods.
Please report back what happens. There are lots and lots of people here that can help you out.
By the way, here is somebody that claims they will sell you a new motherboard at a reasonable price. But, we're not to that point yet.
http://www.discountelectronics.com/index.php?l=product_detail&p=2790
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And be very, very careful when you put the memory chip in make sure the snow dust or dirt on the pans and of course you will avoid touching the pans directly with your hands if you have to clean the pants off of something try a small cloth that has been dampened with a little bit of alcohol. Do not use a cotton swab, Italy's fibers on the pin connectors.
Geek-9pm, your voice recognition software veered off course in a few spots, I believe.

I'll take a guess at what you meant for the WORDS I high-lighted. "pans" and "pants" should be pins, right? And, "Italy's" should be "it leaves"? Quote
This post is being done with speech recognition software. Some of the grammar and vocabulary may seem strange.

Geek9PM it looks like it's working pretty darn good for you...
Nicely done.Maybe he meant Ireland ? ?

Oh good grief! The thing thinks I have an Italian accent?
So I going to have to practice a little bit on pins and pans.
Thanks for being patient with me.Send me that Lasagna recipe while you're at it...

Soybean,
Major Geeks or Geek Squad.....the one at Best Buy, and yes he used the heat paste,
it hasnt worked.


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