Dc 7700 psu 24 pin - HP Compaq dc7100 PC Desktop

why new PSU,? if PC dead before say so we fix that. ask.
slimlines use a custom HP PSU, not standard ATX.
the PSU on these also have HP custom fan controls from PC mobo
to the PSU, and will fail using any generic ATX psu.
IT NEEDS TO BE HP ONLY PSU, correct HP P/N#
NO PSU LABEL POSTED BY YOU
NOR THE SOURCE, NOR IF A USED PSU.
and both DC power wires, 24 and 4 pin must be connected or the CPU will be dead. 2 key power cords one goes near CPU,see?
some PSU have 120./240ac switch on the rear, and must not ever be set wrong, and is frankly step #1 OOBE. it..

Yes, in almost all cases, a 24 pin PSU can still work on a 20 pin board, the 24 pin connector usually splits at the 20 pin point and will then fit the board socket. Just make sure whatever PSU you buy can do this and you'll be fine. The more important thing is to make sure all the other connectors are the correct style for your board.

no PC model stated, at all... wow, 1984 to 2014 compaqs.
wow.
the PSU is bad if the jumper wire test fails
easy as eating apple pie, do that test. the voltages in the PC case are safe, 12vdc max. (no do not short out power rails.

NO the ATX spec is published in the wiki
the first compaq are 20 pin then later 24
so ill do 24 , just wild guessing what PC model you have.
why must we beg model PCs'
its like saying a Have a FORD car, what ford what engine, see?

jump 16 to 17 (17 is ground)
do not hot wire power OK (good) pin 8,
do not or blow up a good PSU.
never hot wire anything you do not understand
in this case the pin 16 has pull up resistor 5k, in all PSU made on earth. and you ground it (0v logic) to tune power on.
see the schematic in this page, do not blow up IC2.
or you will be sorry, I promise.

http://www.pcdied.com/power.html#Jumper

this works on all PSU made ATX spec. per wiki.

Most of the 24 pin PSU Have the +4 pins colored in green. The green part can be removed by un-engaging two clamps.

Hi davids38,

I really recommend getting a 24-pin adapter Power Supply Unit (PSU). I had this problem once and did purchase a 24-pin adapter for my 20-pin PSU but my computer wasn't stable (random reboots and lock up). I purchased a 24-pin PSU and my computer worked fine ever since. Hope this helps.

Thanks

i prety sure there is no way to do that. you might be better off just going to fries or radio shack or some other electronics store and buying a new one, there is no way to change a 20 pin to a 24 pin srry the best pf luck to you. plus i trying to fix my own problem right now

why wont you buy a new power supply or a plug that converts from a 20 pin to a 24 pin

normal white wire....?
white with red....?
brown....?

this is the psu
this eps 24 pin
as u can see the matter at hand can be preformed, as long as the fitting is compatable

please check whether there is burning in the motherboard due to this there is no switching in the motherboard. plz get the motherboard repaired. their is no problem in replacing the 20-pin psu