Hey I need some advice on a new psu for my system. It's an hp x2 4200 2 gigs xpress 200 graphics. Right now it has a 300 watt hipro http://www.geeks.com/details.asp?invtid=HP-D3057F3R&cat=PWR So I have a few questions 1) What is the 4 pin aux connector? I've looked at psus and haven't seen this before 2) I can't shut down my comp, when I press shut down it might go to the Windows is now shuttting down screen but never happens, I have to manually press the power button. So do yyou think it is because of the psu? 3) Any PSU's you think will fit/work for my computer. (It's a tight fit.) I might upgrade the video card so keep that in mind with the recommendations.