Motherboard that is compatible with older components?

[Deriv]

Sooo, I decided to upgrade my old desktop with some new products and everything seemed to be going well.

6 GB RAM detected perfectly with Windows 7 and the only thing not working was the sound. I updated the drivers since it was a fresh install of windows but still no sound. I then realize that I am running on the onboard gpu instead of the new gfx card I just got.

I decide to shut everything down so that I can take out the gfx card and disable the onboard gpu. Well the latch on the PCIx slot would not loosen for the life of me but I kept trying and eventually the ****** just snapped off..

Now I figured I could just make sure the retaining screw to the case is tightened to keep the card secure even without the latch. But when I put the card back in and secured it, the computer would not boot.

Everything powers up but the screen wont display the bios screen let alone boot to windows. I tried having the card in but with my monitor hooked up to the onboard video instead, still nothing..

I take out the card and it boots fine from the onboard when no card is in the slot. I tested this with my old card that worked fine for 4 years and I was faced with the same scenario.

Did my PCIx slot fail? If so what would be the best way to go about this?What else could cause this to happen? (Pretty sure both cards are not dead) Am I just going to have to buy another motherboard? (Hopefully one I can use most of my old components for) OR can I get this PCIx slot fixed for cheap?

SPECS:

mobo: http://www.newegg.com/Product/Product.aspx?Item=N82E16813138057&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=4165478&SID=v7wsw64yrdfk
BIOSTAR TA690G AM2 AM2 AMD 690G HDMI Micro ATX AMD Motherboard

gfx card I just got: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130625&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=4165478&SID=1v3ykzgafcqd2
EVGA 01G-P3-1556-KR GeForce GTX 550 Ti (Fermi) FPB 1GB 192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Processor: AMD Athlon 64 x2 dual-core 6400+

PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817163109&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=4165478&SID=1wrz3o788avdi
SILVERSTONE ST60F 600W ATX 12V 2.01 / EPS 12V SLI Ready Active PFC Power Supply
I talked to EVGA tech support before the PCIx slot failed and he said my psu might not support the new card, is this true? I thought that 600W was more than enough.

RAM: http://www.newegg.com/Product/Product.aspx?Item=N82E16820134730&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=4165478&SID=1457x8hwheglr
Kingston 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model KVR800D2K2/4GR
(just bought this one)

and http://www.newegg.com/Product/Product.aspx?Item=N82E16820134635&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=4165478&SID=14o9l4oqkzacz
Kingston 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model KVR800D2N6K2/2G
So 6 GB total

tl;dr: Do I need to buy a new mobo and/or PSU?

If so, what would be a good motherboard that would be compatible with all of my older components? I was looking at http://www.asus.com/Motherboards/AMD_AM2Plus/M4A785M/#specifications but I can't seem to find it for sale (Newegg discontinued selling it..)
Is SDRAM compatible with DIMM slots?

I just wanted to do a bang for my buck upgrade so I could be able to play Battlefield 3 and Skyrim, but its looking like things are about to get pricey..

Sorry if any of these questions are obvious, but as the saying goes, the only dumb question is a question never asked.

 

[o1die]

Newer faster video cards have specific ports for the power supply, such as a six pin pci-e. Some models of silverstone are ok from a quality standpoint; just be sure you have the right connection from the ps to the card. If the card is ok, your system should post. Also be aware that some case slots are a little crooked, and may shift the card up out of the pci-e slot enough to cause a no post situation. Try the card loose without the hold down screw and see if it posts. If you want to try a different board, this one will work with your ram and is affordable: the asrock A785 GM-LE for $53.99 plus shipping at newegg.com. Your windsor 6400 works with this motherboard. When in doubt, be sure to check the "cpu support" section for any board before ordering.