With modification to change barrel connectors to 4 pin DIN connectors?
Feeding an electronic system computer or other devices from multiple external power supplies is not a good idea if you do not have any electronics knowledge. You would need to make sure that one does not affect the other. This is not a simple task to explain through fixya. There are a lot of things to take into account. When you mix two adapters that have their own voltage regulation control mechanisms, you never know when you hook the two of them together, what may happen. Even internal power supplies with multiple voltages do not join their outputs together. I understand why you may be thinking of doing this. Adapters with lower current capabilities are less expensive than an adapter that is twice the amperage. But trust me, you do not want to risk damaging your expensive electronic gear to save a little on the correct adapter.
SOURCE: Problem with motherboard MSI P35 Neo2-FR
I just bought a msi p7n sli platinum. my board is better than yours hahaha, j/k, all playing aside, I have the same problem with the 8pin power connection. A power supply rated v2.2 has the proper 8 pin connection, but 2.1 or lower doesn't, regardless, plugging in two 4 atx pin connectors wont work because you'll be taking 4pins away from the main 24 pin plug (even though my manual says 20 pins will work, it doesnt, they lied!!!). However, when I put the normal configuration of 24 then the 4 in place of the 8, it works fine. The only thing i would worry about is overclocking, thats when you need to be careful with your voltages, etc. Also, I read somewhere that the 8 pin is actually 2 four pins, each 4 pin is for each side of the cpu...
SOURCE: 12v 4-pin connector issues
Sounds like your board has some issues (might of even caused your power supply to fail) try unplugging all IDE devices, removing pci slotted cards and anything else plugged into the board so you are only left with the Motherboard, Processor and Memory. Try to start the board now to see if one of your devices was causing the problem. If the board now comes on, try installing the devices back one by one to see which one is causing the problem. If that still doesn't work, try to further test your possible to see if they are working correctly. If all that fails, your board is probably the cause and needs to be replaced. Good Luck.
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I took the power supply apart and found out that the two pairs of voltages on the 4 pin din were fed by on pair of wires. So the +19V supply had a thick wire which was then split into two, and then connected to two of the 4 connector pins. The Negative terminal wire - same thing. So in fact it was a single power supply. I have noticed other manufacturers, like HP, did the same thing, but they rotated the 19V lines so you could not use and HP adapter on a Toshiba or an MSI. There is NO need for this plug. HP and others now sell adapters with barrel plugs for their AIO computers, I just ordered one up for almost the third of the cost, and will simply transfer one wire to the other. The only reason I can fathom for splitting the wire is (a) increase price as people can't source the supply elsewhere because it has a multi pin DIN connector or (b) one side supplies digital and the other analog circuitry and they are trying to keep the noise down - which is possible, but not likely (See the Art of Electronics for an explanation).
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