Complete shut down (No warning) in fullscreen

Acer Aspire am5800-u5802a mini-tower des...
May 3, 2010 at 05:15:55
Specs: Windows Vista, Intel(R) core(TM)2 Quad CPU Q8200 @ 2.33Ghz - 6.00 GB Ram
Ever since the purchase date which is not more than 6 months ago, my Acer Aspire M5800 has been shutting completely down as if the power was unplugged. This has been known for me to happend only when using any type of fullscreen mode, and today it happend for the first time when using a virus scanning (AVG free).

After several hours of searching on the internet i'm out of ideas and nobody seems to have any similare problems.

I'm hoping for some assistance here.

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May 3, 2010 at 10:30:18
Probably the most common cause for a computer suddenly shutting down and staying off is the mboard's bios has shut down the mboard because the cpu (processor) has become too hot and exceeded some max temperature. In that case, the computer will not start up again until the cpu has cooled to below that max temp.
Probably the second most common reason for a computer shutting down suddenly is the power supply has gotten too hot. Most power supplies have a feature that shuts off the power supply in that situation. It won't start up again until it has cooled to below some temp.

Apparently your model has
- no case fan. It has a cpu fan and the fan(s) in the power supply, but the air exiting the case can get noticably quite warm, indicating it gets quite warm inside the case.
You could install a case fan - the best place is at the back of the case, as close as you can to the top.

- a tiny air intake port at the front of the case at the very bottom - make sure you're not obstructing that opening, otherwise the cpu is likely to get too hot. E.g. don't have the case sitting directly on carpet.
- a small opening on the top of the case near the ports. Don't obstruct that opening either, e.g. by placing something on top of the case.

- a power supply that has only a bit more capacity than the minimum needed. Apparently your GT230 video card chipset is a re-branded Geforce 9600GT.

The Geforce 9600GT chipset requires your system has a minimum 400 watt power supply.

Your power supply's capacity is apparently rated 450watts, 500 watts peak.

Using programs that tax your video performance more requires more power from the power supply. If the power supply is inadequate it's more likely to get too hot in that situation.

In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.

In this case, that's a minimum 500 watts.

Also, brand name system builders almost always install el-cheapo power supplies that you're more likely to have problems with that you wouldn't have with a better quailty one.

If you need to get a PS with more capacity, you can usually replace it with any decent standard sized standard ATX PS.

Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.

Don't buy an el-cheapo PS.
See response 3 in this:


Go here:

First review:


Unfortunatly, the air intake for the case is located on the bottom of the front facing. Therefore, if you place your unit on carpet, the carpet covers up the entire intake. Poor design!

Third review:

This is the power supply inside:

Max Wattage: 450

Peak Wattage: 500

(He was having problems until he replaced the power supply with a 750 watt one.)

Page 2

Third review

Cons: Dead on arrival, sent it in for repair, waited two weeks, received machine back.

I learned that machine had received new power supply but, much to my chagrin, found that although it now powers on, it still will not boot;

Fifth review:

Cons: 1.The open ventilation slot just behind the 4 USB ports and 2 audio plugs on the top of the machine should be screened off to stop metal or metallic objects from dropping into the pc.

3.Belarc Advisor shows the mobo as an Acer EG43M; Google shows the EG43M as a Gigabyte board.

Page 3

Second review

The GT 230's 1.5GB of video ram definitely sets itself apart from the 9600 GT (512MB), which the video card is based off of.

Page 4

First review

Cons: GT230 just a rebranded Geforce 9600gt

Overall, several people reported problems with the power supply (e.g. DOA), and at least one said there is only a cpu fan inside the case.

NOTE that if you change the video card to a different one, you may need a power supply with more capacity in any case.

Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.

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May 5, 2010 at 13:54:50
Thank you for this wonderful reply,

I am somewhat confused though, i think its pretty safe to say that the power supply isn't the problem since it only happends when i use fullscreen programs unless i miss understood something? .. Hypotheticaly i could have the computer running 1 month on without it shutting down, but 1 minute after i use fullscreen mode of any sort, it shuts off the power.. But i might have miss understood, care to clarify for me?

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May 5, 2010 at 19:08:38
I'm not sure what you mean by full screen mode.
I run everything in full screen mode, as in, whatever it is I have it fill the screen, if I can.
If you mean when you run something such as fast moving video on the web, or the fast moving video in a game, in full screen mode, rather than a default smaller window, the larger the window or screen, the more power that requires from your video card, the more load there is on the power supply, and the system in general.

If your power supply is just barely keeping up with the load on it for whatever reason, it may be defective or just plain inadequate, or if the cpu is heating up to just under it's max temp the bios allows before it shuts down the mboard, when the window is smaller, then making the video fill the screen can be just enough more of a load for the power supply or the cpu to overheat too much in a short time.

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