Question: Here's an image of my motherboard (from a dell optiplex 740):

![enter image description here](https://i.stack.imgur.com/XcCyy.jpg)
![http://img818.imageshack.us/img818/593/2cak.jpg](https://i.stack.imgur.com/GOspw.jpg)

Will any of these two intel centrino cards fit in here?

* INTEL CENTRINO ADVANCED-N 6235
(=Mini PCIexpress)

![enter image description here](https://i.stack.imgur.com/N40K5.jpg)

* Intel Centrino Advanced-N 6205 for Desktop IEEE
(=PCI Express x1)

![enter image description here](https://i.stack.imgur.com/GgjCa.jpg)

Answer: 
Heres how it works:

1. Chromecast fires up, puts out a Wi-Fi signal
2. You connect to this unsecured open Wi-Fi with a smartphone or tablet. You cannot do this with a wired desktop PC.
3. You tell Chromecast the logon credentials of your home broadband Wi-Fi.
4. You and chromecast log of and log back onto the Home Wi-Fi.
5. You go onto the desktop, add the Chromecast extension to Chrome.
6. Tell Chrome wich casting device to use.

Anything you now play in—for example—YouTube will now stream to the TV. 

Repeat tomorrow, because it seems to forget everything when not used for a while.
IF you are using Dual bank router like Linksys E3000 make sure your router is configured to listen on both 20Mhz or 40Mhz .
On your Linksys router configuration page click on the wireless tab -> basic configuration -> select manual. Then on the channel with select Auto(20Mhz or 40Mhz)