Trying to hook up 3 monitors - Radeon HD 7770

You have to have a VIDEO CARD model that has Eyefinity support.  If it doesn't say that on the box for that model card then its VERY LIKELY that 3 monitors will NEVER work.  They make specific cards that support 3 or more monitors via EYEFINITY but NOT EACH AND EVERY Model supports this or even each GPU Series.  Its up to the card maker whether they support this or not.  Thats why there are "EYFINITY" marked versions of the cards that GUARANTEE Support of 3 monitors or more.

AMD Radeon™ HD 7770 GHz Edition Feature Summary

2GB GDDR5 Memory

AMD Eyefinity multi-display technology

• Up to 6 displays supported

Use of 3 or more displays with AMD Eyefinity technology requires a DisplayPort-capable panel with AMD Eyefinity validated dongle.

See http://www.amd.com/EyefinityDongles for a list of validated DisplayPort dongles.

Maximum Supported Resolution 1920x1200 on displays that support Reduced Blanking Intervals, this is the upper resolution that the dongles support. Other circumstances such as a monitor's supported timings/resolutions as reported by a monitor's EDID may limit the supported resolution below this value. SL-DVI Active adapters support a maximum resolution of Displays that do not support Reduced Blanking Intervals may report a maximum resolution of 1600x1200. To determine if your display supports reduced blanking, please contact your display vendor.

So even if 2 of my monitors work I still need to purchase a dongle for the third regardless?  As of right now I have my Samsung TV on the Display port using an HDMI convertor and its working fine.  I am really hoping I dont have to buy another piece of hardware just to get this to work.  Regardless of which 2 monitors I plug into where, they always work, getting the 3rd never does though.  

I myself am not familar with AMD Eyefinity multi-display technology however the first thing I would recommend would be go to the card manufacture website and verifi what  exact modle you have and look for a users guid, this should tell you what feature set your card has and where or how to enable it, you may need to go someplace in the configuration propertys to enable 3rd monitor functionality. also traditionaly you needed another graphics card for monitors 3 and 4.

AMD Radeon™ HD 7770 2GB GDDR5  :emotion-2:

http://www.amd.com/us/products/desktop/graphics/7000/7770/Pages/radeon-7770.aspx#3 also select the foot notes on this page to see this

• AMD Eyefinity technology works with games that support non-standard aspect ratios, which is required for panning across multiple displays. To enable more than two displays, additional panels with native DisplayPort™ connectors, and/or DisplayPort™ compliant active adapters to convert your monitor’s native input to your cards DisplayPort™ or Mini-DisplayPort™ connector(s), are required. Support for six simultaneous displays may require complementary products compatible with DisplayPort 1.2 Multi-Stream Transport. Maximum number of configured displays may vary - check with your component or system manufacturer for specific model capabilities and supported technologies. SLS (“Single Large Surface”) functionality requires an identical display resolution on all configured displays.

so it looks like you may have to find and set the same display resoluytion on all 3 monitors to enable this function and it also looks like all 3 must be connected via display port, so for your situation it would seem you need a hub to convert the various connector types to the display port output of your card.

If this card has a Display Port out,  you need a "Active" Display Port Adapter to use a 3rd monitor