Thanks for the reply

I explain my problem ...

So I bought this to replace a graphics card gtx 745 so pretty happy .. I installed and everything, so the peak-e 2 more connected 6pin connection to the motherboard and then start the graphics card runs but no image so I have to plug my HDMI on the graphic chipset for an image and still see in the device if it is recognized but nothing ...

I think the problem is the supply me explain:
So I have this computer http://www.asus.com/fr/Desktops/ROG_G20AJ/
There is no power in it and only ally block as a portable computer if you want.
There is a 180 W and 230 W, which is the following http://www.google.fr/imgres?imgurl=h...ed=0CCQQrQMwAQ
Alas 230W jumped one day and I can not find it in the trade I replaced the 230 W to 240 W with a dell which is compatible with the tip and the voltage, 19.5 V. (http: //www.adaptateurac.com/index.php?main_page=product_info&cPath=2&products_ id=16661)
Could this be the aim that is the problem I'm having the original one?

Let me explain. When I only plug the 180W graphics card still runs but is obviously not recognized. However when I plug the 240W nothing is happening ...

Is it normal ...
What you advise me?

ps: CMOS already doing, BIOS updates etc ...

Thank you in advance

so if yours came with a 745, then you bought one of the PSU's separately? you may have to adjust the jumpers on the board so that the power goes to the graphics card properly. I haven't needed to do so with my setup but yours may need to be adjusted.