I purchased a GigaByte GA-MA78LMT-S2 board to replace e-Machine factory issue. Need diagram to hook-up power leads. I don't want to cross anything up.

Just go to the link below and select your operating system and the audio driver for it:
http://www.gigabyte.com/products/product-page.aspx?pid=2186#dl

You need all the drivers, each peripheral has it's own driver that needs to be loaded.

Hi,#
Yes they can be replaced if you were thinking of doing it yourself, desoldering the old ones is the hard bit, however if you were looking to get someone to do it for you I suspect the price may well go at least around the same price as simply replacing the board as its available
http://www.kikatek.com/product_info.php?products_id=37836&source=froogle
£37 (around $50 if your stateside)

http://gigabyte.com/search/search.aspx?kw=GA-945GZM-S2 http://gigabyte.com/products/product-page.aspx?pid=2603#dl
Don`t forget to vote ;)

CLICK HERE TO DOWNLOAD GIGABYTE GA-945GCMX-S2 Motherboard Drivers

Something like this one
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4950633&CatId=1588
powerful enough to handle all processors that your board accepts.

You can download the drivers from Gigabyte WEB support site. Please click on this link and select your model motherboard and drivers you require :-
http://www.gigabyte.com.tw/support-downloads/support-downloads.aspx

At first I thought your screen went black during the start up process. After seeing the bios screen. In which case I would've said it was a bios setting for the display. Then I realized that I think you mean that their is no display at all. When you push the power button. Only the monitor led light. So, it may be a problem with your RAM stick/s. You should make sure that they are properly seated in the mother board. If they are new, make sure they are compatible with that motherboard. If you can you should swap them out with known good ram sticks. You could also try installing a video card and see if you can get display to work through that one. Make sure your main power supply wire connector is pushed in all the way. Swap the power supply with a known good one if you can. If still can't get it to work you may want to take the motherboard out and inspect it for burns, cracks, and anything that doesn't look right. Maybe contact the manufacturer of the motherboard and ask them what you can check. hope this helps.

http://www.gigabyte.com.tw/Support/Motherboard/Driver_Model.aspx?ProductID=2373

try these and let me know how you get on

Gigabyte GA-945GCMX-S2 SOUND DRIVER