建议一下.

先确认CPU是Pentium E2200,再检查RAM多一次.

如果BESTBUY或其它店可以退货的话.

买主板,电源和散热硅胶各一个:

MB: http://www.bestbuy.com/site/MSI+-+Micro+ATX+Desktop+P4/Core%26%23153%3B2+Duo/Quad+Motherboard+(Socket+LGA+775)/9486647.p?id=1218112690301&skuId=9486647

PSU: http://www.bestbuy.com/site/Cooler+Master+-+Elite+460-Watt+ATX+CPU+Power+Supply/1511293.p?id=1218265768522&skuId=1511293

先换PSU,自检试机,确认旧PSU好坏.

再换MB,记得涂散热硅胶.

如PSU AND MB都换上还不行,应该是CPU坏了.

下面链接供参考:

Newegg.com

PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817171046

MB: http://www.newegg.com/Product/Product.aspx?Item=N82E16813138183

我在班门弄斧,不要见笑.