Well, here's some things I'm unsure of.
1. The RAM is in the black slots (AM3 Mobo FYI)
2. I don't have an 8-in motherboard power connector. I just have a 4+4-pin
And I don't know what you mean by "reset the BIOS by pulling the battery" I can't access the BIOS because I can't boot
From the manual, it looks like putting the RAM pair in either the blue or black slots is acceptable. (I would have gone for the blue slots, but it's not supposed to matter.)
4+4 pin +12V CPU connector has the same function as an 8 pin. (Some power supplies include both 4 and 8 pin connectors. Yours has a single 8 pin, which can be split.)
Removing the CMOS battery is one way to clear the CMOS settings. The other way is to use the the Clear RTC jumper. (See p. 2-21 of your manual.) The normal way to do it:
Turn off the PSU. If it has no switch, unplug it.
Hold down the PC's power button to reduce any residual charge.
Move the jumper to the clear position for 5-10 seconds.
Move it back.
Restore the power.
Note that the green LED on the MB just shows that power is being applied to the board. It's not very useful as a diagnostic.