Excuse the long post but I am going to start from the begining just in case any of it is relevant. A few years ago I bought a HP pavilion s5229uk last week the graphics card gave up on me so I decided to replace it with a asus Hd 6450 silent graphics card and at the same time I shoved in 2 x 4gb g.skill ripjaw ram sticks. All was working well but the graphics cards was getting hot very quick so yesterday I decided to pick up a new pc case that will allow me extra room for fans etc and a 750w PSU to power everything. Upon installing everything into the new case every time I turned the pc on it would turn on for a split second then power off. Upon doing some research on this forum site i realised the motherboard was shorting on the case. So I got some rubber stoppers and job was a good one. Now it will turn on but I get a CPU fan has failed message, computer will turn off please service asap error message. I looked inside the case and the CPU fan was not starting so I thought no problem I'll just pick a new one up today. So I picked up a new heatsink and CPU fan installed it all and it still won't start still the same error message. I have tried plugging it into the sys fan slot on the mobo and it works ok on there. I feel like I should also mention I only have a 3 pin connector on my CPU fan slot on my mobo and the new fan is has a 4pin connector but I have plugged it in as instructed on the net so that it should still work but it will just be constantly on. Any help or ideas here guys?