Banging head against wall

[Dakota Mon]

Ok heres my situation....

A while ago I purchased the components to try and build my first
computer. I decided to use an AMD Sempron processor with a compatible
motherboard. I assembled all the parts, configured the jumpers etc and
flipped the power switch. Nothing happened. So I removed the cover from
the computer case and tried to determine what was wrong. I decided that
maybe the power supply unit was dead so I replaced it with a spare I
had purchased and still nothing happened. The chances of two power
supply units not working seems very remote but I was hoping at that
point that that was what had happened.

I had an old but working pentium 2 system so I tried this. I took both
powersupplies from the AMD new system and tried to see if I could use
them to power up the old pentium 2. Both worked. I then tried to attach
the old system's power supply to the new motherboard. It did not work.

So at this point I'm thinking maybe it's the motherboard but then I
purchased another AMD motherboard but it gave the same result as the
other one.

Now I'm stumped so the purpose of this post is to gather some insight
and ideas on what could be wrong. Granted there is little info to go on
above but the gist is provided. Any ideas? Any troubleshooting steps
left?

 

[JAD]

there is one more component between the board and the PSU.
the power switch with its leads to the board

 

[Shinnokxz]

Also, try powering it outside of a case if you haven't already.

 

[jaster]

Ok heres my situation....

A while ago I purchased the components to try and build my first computer.
I decided to use an AMD Sempron processor with a compatible motherboard. I
assembled all the parts, configured the jumpers etc and flipped the power
switch. Nothing happened. So I removed the cover from the computer case
and tried to determine what was wrong. I decided that maybe the power
supply unit was dead so I replaced it with a spare I had purchased and
still nothing happened. The chances of two power supply units not working
seems very remote but I was hoping at that point that that was what had
happened.

I had an old but working pentium 2 system so I tried this. I took both
powersupplies from the AMD new system and tried to see if I could use them
to power up the old pentium 2. Both worked. I then tried to attach the old
system's power supply to the new motherboard. It did not work.

So at this point I'm thinking maybe it's the motherboard but then I
purchased another AMD motherboard but it gave the same result as the other
one.

Now I'm stumped so the purpose of this post is to gather some insight and
ideas on what could be wrong. Granted there is little info to go on above
but the gist is provided. Any ideas? Any troubleshooting steps left?

A little light on specs.

Only put in memory, cpu, cpu fan connect power supplies to motherboard
(and vga if required). You should see bios screen and cpu fan spinning.
If you get nada then you wired incorrectly or did not seat a component
correctly. Sometimes the motherboard manual have different pinouts than
what is actually on the mb. So check the writing on the motherboard
against the manual. I've had 2 ECS boards like where the poweron
connection was not as written in the manual.

If the cpu fan spins you're getting power through mb and you can connect
more components into the system.