Any reason that a new psu wont work on a old board?

Phil2008

Phil2008

Phil2008

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My mates psu died a few days ago, so I gave him a spare 1 untill he got a new psu.

He's got a old gigabyte ga-7zx board about 5yrs old now or so, and i suggest to him to buy a "Enermax Liberty Series ELT400AWT (400 Watt)". I know its a overkill but he has hes pc running all the time, and I thought it would last forever.

Anyway he got it this morning, connected the 20pin plug to his board and connected the hdds and cd drives, powered it up, power going though the board but his case fan wasnt working that connected to the board and theres no display. But there deff power going through, cos the lights on, on his board and the light on his wireless network pci card lights up. it sounds like theres not emough power going though it, and it works fine when my spare psu is connected to it. Hes bringing it over to mine some time to have a look at it. Any ideas why its not working guys?

This is the board http://guru3d.com/review/gigabyte/7zx/ and hes got a athlon 1200 cpu in it
 
The PSU should be fine but there are plenty of incorrect ways he could be wiring the connectors mistakenly, as a whole bunch of threads on this forum can illustrate. The PSU may well have both 4-pin mobo power connector and 4-pin gfx power connectors that can be connected the wrong way round. I'm sure it'll be something that is fairly obvious when you get two pairs of eyes on it.
 
Growlingfish said:
The PSU should be fine but there are plenty of incorrect ways he could be wiring the connectors mistakenly, as a whole bunch of threads on this forum can illustrate. The PSU may well have both 4-pin mobo power connector and 4-pin gfx power connectors that can be connected the wrong way round. I'm sure it'll be something that is fairly obvious when you get two pairs of eyes on it.
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The board only takes the 20pin connection, so you cant really go wrong.
 
no reason why not assuming the 4 pins extra for 24-pin are removable to make it 20 pin, it might need the 4pin "p4" lead too, on my old duron 1.8ghz pc it needs the 4pin otherwise it doesnt boot.
 
speedy2004 said:
take a look at the manual guys, and tell me what you come up with??

http://www.enermax.com.tw/english/upload/document/M2006988444695322.pdf
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Had a look at that and the mobo manual. The mobo doesn't require the extra 12V connector as you said (sorry, my fault for thinking in modern terms :p ), so the only obvious problem I can imagine happening is not actually detaching the extra 4 pins and plugging the wrong 20 pins into the mobo, i.e. plugging pins 5-24 in rather than 1-20.

Edit: Your spare PSU has all the same connectors as the Enermax, right? If he knows how to plug that one in correctly then I guess it would be highly unlikely that he's doing something like what I'm describing above.
 
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So no idea why it shouldnt work then?? heres a pic of the board.
tCQpf8dg_7zx.jpeg
 
because it has ISA it might need the -5v and might be refusing the boot because there isnt any voltage on the -5v, you might need to either 1) track down an old power supply with -5v, or 2) try and find out if theres some way to trick it into thinking the -5v is connected (it wont actually need it assuming no ISA cards are used), i dont know enough about electronics so i dont know if its even possible but someone who knows a lot about it might be able to help with that.
 
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figgered out the problem, the yellow wire in the 20pin plug was half out, and it did the same thing on my pc, so I pushed the wire in further, tried it again and it worked. Not very good from enermax hey guys

Now just hope it works on my mates pc, I cant see why it shoudnt if I got it doing the same prob with my pc too?
 
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