It has a Radeon HD 4350 video chipset.
From the AMD web site:
ATI Radeon™ HD 4300 Series System Requirements
300 Watt or greater power supply (350 Watt for ATI CrossFireX™ technology in dual mode) is recommended
Acer 300W Power Supply - PY.3000B.001
Notes: 24PIN, NN (POWER SUPPLY 300W W/ O PFC LITEON PS-6301-08A)
That ad lists it as for $39.xx brand new, so it's an el-cheapo power supply.
You are much more likely to have problems with an el-cheapo power supply
(The Acer Group of companies includes all Acer, Gateway, and emachines computers.)
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.
So - your HD 4350 requires your system has a recommended 300 watt or greater PS capacity, and your power supply capacity is stated to be a max (total combined output) of 300watts.
In this case, when you have the MSI R4350 installed, your power supply is being loaded to 100% or nearly so of it's capacity much of the time
El-cheapo power supplies frequently can't actually handle being loaded that much.
Your problem could possibly be caused by a poor connection of the card in it's slot - you could try removing the MSI R4350 card, wiping off it's contacts, don't touch the contacts after that, and installing it again, making sure it's all the way down in it's slot,
- but if that doesn't help, you probably need to replace the power supply with one that has more capacity.
If you need to get a PS with more capacity, you can usually replace it with any decent quality 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 (in quality) PS.
See response 3 in this:
Note - I may have mentioned Coolermaster in that - I have recently found some models have only a 1 year warranty, some are known to have premature fan failures, some are known to develop failing electrolytic capacitors.