Solved Weird problem with grandmother's 5 year old PC

Lenovo / 20157
June 24, 2013 at 07:30:08
Specs: Windows 7, Core i5 3rd Gen 2.501 Ghz / 4GB
My grandmother has very old pc about 5 year old, following are the specs:-

MSI MS-7312 Mobo
Amd sempron le- 1100
1 Gb Ram
160 Gb Hdd
450 Watts Intex PSU

I dont know whats happens to it, sometimes it starts & sometimes it doesn't.

CPU just starts but lcd has no display.
I made a memtest86 for an hour & it passed without any errors when pc whas working, also the HDD also spins as i can feel it when touching.

But now there is no display but cpu stays on doesn't give beeps so that i can figue whats is causing it.

Also i cleaned the heatsink & applied new thermal paste, when it was working i checked in bios it has no overheai issue.

But just today morning it stopped working keeping the cp u on with no beeps to find out whats faulty & no display on screen it just goes to power saving mode.

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June 24, 2013 at 08:34:03
✔ Best Answer
A CPU is a socketed chip that fits in a motherboard, it's NOT the computer. In your case, the CPU is an AMD Sempron LE-1100. My guess is your problem is this - 450 Watts Intex PSU. It's cheap garbage. Are you in India?

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June 24, 2013 at 08:54:54
A CPU is a socketed chip that fits in a motherboard, it's NOT the computer

I know, but was in hurry when typing.

yes i'm in india & whats is wrong with PSU?

Its a custom built, i purchased it from a computer shop.
its was working all fine before, i'm facing such issue from last 2-3 months.

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June 24, 2013 at 09:00:32
I would say it is the power supply as well. Sometimes it starts & sometimes it doesn't is a sure sign the power supply is struggling to cope with the demands put on it.

Just to reiterate, the CPU is the chip you applied the thermal paste to. I hope you did this unnecessary procedure correctly otherwise you could have turned a minor problem into a serious one. The only time you would need to replace the thermal paste is if you are experiencing overheating.


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June 24, 2013 at 09:04:51
i used a dot method when applying thermal paste & after that everything was working fine, i did it before 6-8 months.

Also is there anything by which i can make sure that PSU is the only problem & not anything anything else.

I dont wanna spend money on this crap when i'm going to make a new custom built soon!

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June 24, 2013 at 09:24:22
The fact that it works sometimes is a good indication that the hard disk, memory, motherboard, video etc are working properly. If they were at fault you would get some warning bleeps.

But you don't because without power, nothing works. The only way to eliminate the power supply is to substitute it with a known good one.


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June 24, 2013 at 09:35:22
its a 450 watts PSU & my PC has such a basic hardware ( no graphics card ), after looking at the specs do you think that it requires a half of whats my PSU can supply?

Please don't take it offensive, just figuring thins out.

Also one thing i want to say is when it boots up, sometimes suddenly it hangs & display turns into vertical or horizontal lines of the same color screen was displaying.
( uff sorry can't explain it properly )

is that also related to PSU problem?

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June 24, 2013 at 10:54:13
"its a 450 watts PSU"

It doesn't matter, it's an Intex so it's garbage. We deal with a lot of people from India in these forums & there's a very poor understanding of PSUs in your country. Not just by users, but also by the people that sell them - I don't know why that is, but it is!

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June 24, 2013 at 12:14:31
So looking at the specs, what PSU will you suggest?

lets replace the PSU, check it & sell this crap right away

this system has become a pain in my ass!

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June 24, 2013 at 14:09:07
Corsair, XFX, OCZ.
Look at the Corsair CX430 model if you can get a decent price on it. It is a very good model for moderate general purpose systems up to mild gaming systems.

You have to be a little bit crazy to keep you from going insane.

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June 24, 2013 at 14:33:45
Many of us use the CX430 psu here, I also keep one in the house to confirm or eliminate power issues with the machines I work on.

Listen to Stuart, listen to riider, listen to Fingers, listen to me! Get rid of that junk psu before you do anything else. We are not making this stuff up because we want to sell you a power supply.

Audares Juvo

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June 24, 2013 at 19:48:39
You asked about other possibilities. Take a look at the capacitors on the motherboard, especially the ones surrounding the cpu socket. If any appear to be puffy like a soda can that's been in the freezer too long then they need to be replaced. A circuit will tolerate some variance from ideal but bad caps will eventually push it too far and the motherboard won't work.

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June 24, 2013 at 21:58:13
Will look at that PSU guys..

I know about caps from long time, but there is no none seems faulty, no puffiness on their top.

Today morning i pulled out the ETHERNET ADAPTER which i had extra as a spare along with the one built in MOBO.

And boom!! Pc booted but after boot screen got the black screen, than pressed the reset button and now its working..

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June 24, 2013 at 22:32:53
So that seems to have fixed it? Just goes to show that perhaps the best way to start is to strip it down to bare bones to see if a peripherial is at fault.

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June 24, 2013 at 23:24:31
I think PSU is the only fault, it may not be able to supply power to all hardwares when ethernet adapter was mounted in MOBO & also i removed the DVD Drive.

Now will see how long it stays with me or else going to replace.

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June 25, 2013 at 04:47:15
Removing the Ethernet Adpator and the DVD drive had the effect of reducing the load on the power supply so it is now coping,

It seems that whoever built the computer put the absolute minimum spec Power Supply they could get away with.


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June 25, 2013 at 08:00:31
The power rating isn't what is really important about a PSU. What is important is that it supply consistent and reliable power on each of the output lines. Many cheap PSUs have a problem with that, even though they might theoretically be able to provide rated power. And many have a problem with that as well.

Another thing about cheap PSUs is that they don't like to die alone but often take the motherboard and other components with them. A cheap PSU can be quite expensive in the long term.

A cheap PSU is a poor way to economize. Unfortunately, many system builders have discovered that a cheap PSU is a cost effective way to build an inexpensive, although unreliable computer. But it usually lasts the warranty so they don't care.

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June 25, 2013 at 13:34:39
And let's not forget that a PSU (especially a cheap one) doesn't last forever even if the demands put upon it are constant. It suffers from wear and tear over time just like anything else, including getting clogged up with dust through the cooling vent which eventually impedes correct operation of it's cooling fan. This in turn adversely affects the PSU's ability to do it's job.

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