|You probably have a 300 watt power supply capacity - that's what's listed here:|
eMachines ET1331G-05W Refurbished Desktop PC
There aren't many video cards you can buy that are okay with that meagre capacity - most video chipsets on cards require a higher capacity than that.
Your computer probably has a BESTEC power supply. They have a very BAD reputation. They are A LOT more likely to malfunction than average, and when they malfunction, or especially when they fail completely, they are A LOT more likely to fry something else - usually the mboard ! That's the most frequent reason an emachines desktop system fails to boot !
You may have noticed that there are many Refurbished emachines desktop systems for sale on the web. It is probable that most of those originally had a BESTEC power supply that malfunctioned or failed completely ! The BESTEC power supply has often been replaced with another BESTEC power supply !
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.
If you're a gamer...
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.
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:
DO NOT buy a BESTEC power supply !