Unfortunately they don't make the adapters you are looking for. They make the reverse of what you are looking for since there tends to be a lack of SATA power adapters usually. If you can, try stacking the molex adapters for two or more fans together, so you can then use one for the video card. Otherwise if you power supply has the availability, try replacing the extra SATA adapters cord with a molex adapters cord. Otherwise I might just recommend upgrading your power supply, which depending on the video card your using you might have to do anyway. New power supplies come with many more adapter cables and rails to connect power cables as well. Good luck!

Plasmas can give you better picture quality, or at least really used to. Plasmas are known for their blacker blacks and whiter whites, giving you better contrast. They also have insanely high refresh rates compared to most LCD's. Which means you get a smoother better quality picture. But to really take advantage of these you would want a high end gaming system (XBOX 360 or PS3, not Wii) or a blueray player. A downside to plasmas is that they give off a lot of heat from the screen, and I mean a lot, you can notice standing in front of them. They also have to be handled carefully, laying them flat or on the wrong side can ruin the TV completely. Depending on what you want to use it for, LCD's are becoming more common and cheaper. Unless you want gaming, probably go with a LCD instead, even for blueray, just remember to consider getting a high refresh rate like 120 hertz more than the standard 60 hertz LCD's usually have.

Depending on what you have in the system will depend on what power supply you need. If it still has stock parts, a 250W to 250W power supply will do the job, but if a PCI video card has been added or other devices, might want to upgrade to 550W or little more. Biggest thing to watch out for is that power supplies have adapted some since your system came out. Things like PCI-Express adapters or compatability are huge factors now days, but your system is way too old for this technology. Depending on prices and other values, might be worth it to just buy new tower.

If it is your integrated video card giving you trouble you need to get a Mini-Graphics or Video card. If you can try attaching a different monitor or try a different cable first. Mini-Video cards aren't as common as regular video cards, but if you do get one make sure you find one that is PCI or PCI Express. These are the internal slots you have available, the video card you have now is located on the motherboard already and cannot be removed, but you can still install a new one. Geek Squad does a great job doing this for you, integrated video cards can be a hassle to upgrade.