Upgrading psu on a hp 3707c slimline

Jason198029 · Aug 1, 2013

I recently purchased a flex 300w psu upgrade for my hp slimline pc. When I plug in the new psu though my pc will not power up. The stock 160w psu will work just fine. I'm using a mini atx adapter(20atx-24mini atx), to plug psu into motherboard. I've jumpered the psu and fan works. This is the second psu ive tried. Any help on this issue would be greatly appreciated

clutchc · Aug 1, 2013

Doing the jumper test on the PSU simply means it starts. You'd have to use a voltmeter or PSU tester to verify it works.

Can you post a link to the flex PSU and the adapter you are using? And why do you need the adapter? Isn't the board 24 pin?

Jason198029 · Aug 2, 2013

clutchc :

here is the link to the psu i purchased http://www.amazon.com/Replacement-5188-7520-5188-7521-DPS-108DB-1-KENTEK/dp/tech-data/B00896NUFO/ref=de_a_smtd

The adapter is required, because the motherboard has a 24pin "mini" atx female plug. the psu has a "standard" atx 20+4 pin male plug. note the adapter i have does not connect the extra +4pin male plug from the psu. im going 20 pin to mini 24 pin currently. Is it possible the extra 4 pin plug is required for powering the motherboard?

clutchc · Aug 2, 2013

It is very possible. I have personally never tried powering a 24 pin board with a 20 pin PSU (which essentially is what you are doing if I understand you correctly). Here is a pinout of the 20/24 pin: http://img189.imageshack.us/img189/7715/2024pinout.jpg

The extra 4 pins provide additional +12V, +5V, +3.3V, and grd. Perhaps the MB picks up those circuits on separate traces that is required to start the board.

ko888 · Aug 2, 2013

The +4pin portion of the main ATX power connector is there for a purpose. It's not for show.

You should be using one of these adapters: http://www.amazon.com/Supply-Connector-Adapter-Slimline-MotherBorad/dp/B007YA18RS/ref=pd_cp_pc_2

Jason198029 · Aug 2, 2013

ko888 :

Thank you, I will pick up this adapter and give it a shot.

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Upgrading psu on a hp 3707c slimline

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