Wouldnt it be bad to use sata to molex because the molex port might take 75W but sata has like 60 or 65 W ? Of course don't actually use such adapter cables to actually use multiple video cards on the board. If the motherboard really wants all molex connectors to be "populated" you can also buy adapters that convert one molex or one sata into 2 molex connectors. The extra molex connectors would be to provide additional power to the pci-e slots, because otherwise all pci- slots would be powered from just 2 12v wires in the 24 pin connector. Try turning on the motherboard with just the 24 pin connector and the cpu 4/8 pin connector. It's common for a cable to have 3-4 connectors, usually 2-3 sata and a molex connector.
Now disconnect the large 4 pin (4x1) molex from the CD/DVD drive and disconnect the large 4 pin (4x1) molex from the (IDE) hard drive.Your beQuiet power supply has "peripheral" connectors on it, in which you can plug cables that have a bunch of connectors. Then disconnect the 4 pin (2x2) molex plug from the motherboard and the 6 pin (3x3) molex plug from the video card. On newer motherboards there will be an extra 4 pins (2x2) for a total of 24 pins. Start out by disconnecting the P1 (10x2) 20pin plug. Now that you are inside the case, unplug all of the power cords that are plugged into the motherboard and other components. There are lots of different cases out there please refer to you case documentation if you are having trouble. Now remove the 2 screws that are holding the cover in place on the left side and slide it off. You will need a Phillips screwdriver to do this. Here we are using a standard mid tower case and will only be removing the left side to access the computer. Once this is done, you will open the case to your computer. When replacing a power supply one of the first things you want to do is unplug the computer from the wall and remove the power cable from the back of the computer/power supply. If your power supply is still good you will need to reconnect everything and make sure the computer boots up fine and still works. At this point, if you have determined that your power supply is not working properly you will want to replace it. Then turn off the power supply by using the switch on the back of the power supply by turning it to the off position and don’t forget to unplug the P1 plug from the motherboard. Once you have finished testing remove the probes from the P1 plug and turn off your meter. The yellow wire is a 12 volt wire and should read somewhere between 10.8 volts and 13.2 volts. Now remove the red probe from the red wire and connect it to the yellow wire. Once again since this is a red wire, it is a 5 volt wire and should read somewhere in the range of 4.5 to 5.5 volts. Then place the red probe into the red wire. The blue wire is a (negative) -12 volt wire and should read somewhere between -10.8 volts to -13.2 volts. Now test the blue wire by removing the red probe from the orange wire and sliding it into the P1 plug where the blue wire is. Since the orange wire is a 3.3 volt wire it should read somewhere between 3.0 volts and 3.63 volts.
Start by testing the orange wire by placing the red probe into the back of the P1 plug where the orange wire is.
Once the ground is in place you can leave it there while we test the other wires. Now to test the P1 (10x2) 20 pin plug you will want to slide the black probe into one of the black (ground) wires in the back of the P1 plug while it is still connected. Make sure it goes down far enough to make contact.
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