|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:
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!
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.)
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;
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.
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.
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.