do i need to upgrade my psu it 250watts but siad on boxed it need 400watts at least

[hawky13]

do i need to upgrade my PSU it 250 watts but said on boxed it need 400 watts at least and i notice sometime my computer would not load properly when flash drive and mobile broadband still in and i am buying 850 watts in few week time and spec are 2 GB ram am getting 4GB ram in 2 week and am not sure if Intel(R) celeron(R) D is replaceable and my graphics card is HD4650 readon 1GB AGP

 

[Phillip Corcoran]

"my PSU it 250 watts but said on boxed it need 400 watts at least"

Then it should be obvious - you need to remove the 250w PSU and replace it with at least a 400w one.

Your ridiculously underpowered 250w is totally unsuitable for your current system.