Judging from this review, you have a support problem and hardware issues. Keep in mind all vendors have had a product that the market doesn't like. It doesn't mean all of their products are bad.
A 300 watt power supply is a bit small, but adequate. Get a power supply checker and test it. If good, I would get a new mainboard that supports the cpu and memory.
One of these may do the job:
I'd go with one of the Best rated boards.
If you have the funds, get a power supply too. Something along this line:
Might peruse the posts here on building a new PC. Good information.