Hi Just bought the VTX Radeon HD 5450. Tried to install it into my PC but couldn't get any picture. My first thought is that there is no power getting to it, since at the bottom right of the card is what looks like a power port, but no cable supplied with it. Had an old cable which i conected but still no picture, guess i plugged it into the wrong port on my motherboard. Which is an Biostar GF8100 M2+SE. Even if i can get it to power up i think i won't get any sound through HDMI since there is nowhere to connect the motherboards S/PDIF-Out Connector to. Any advice please.

Yiu do have a PCIe x16 slot on your motherboard and you need to make sure you have it installed correctly. As far as extra power, no power cable is required;
A big plus about the Radeon HD 5450 consuming so little power is that it doesn't require an external power source. The PCI Express bus alone is capable of delivering enough current to this card, but a 350w power source is required. When you go to install, the card needs to hook in at one end and you may have to push on tab that hits your case while pushing the card in to get it to fall in place. There is no need for an SPDIF cable with this card. If for some reason you cannot get sound through HDMI, you can get it through ATI's DVI to HDMI adaptor;
http://www.txcesssurplus.com/servlet/Categories
#6141054300G. Once installed you should get a picture but, if you don't see if you can start in safe mode and go to "Device Manager", click on "Display Adaptors" and see if it's in the list. If so right click on it and make sure you see "disable" in the list. If you see "enable", click on that and exit. You may have to disable you on board graphics also. Do initial install off of installation cd then, you can update your VGA and Catalyst Control at AMD's site.