connecting f_panel cables to mobo

Hewlett-packard Presario sr1930nx deskto...
May 20, 2010 at 19:21:20
Specs: windows xp, 2gb ddr
case z7 atx mid tower


okay so i have several cables...

power switch (red, black)

reset switch (black, white)

hd led (red, white)

how do I know which one is positive or negative?

See More: connecting f_panel cables to mobo

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May 20, 2010 at 19:28:37
and power led (blue, white)

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May 20, 2010 at 19:54:09
Should be
[ + ] [ - ]
Power Switch red black
Reset Switch white black
HDD LED red white
Power LED blue white

I cannot guarantee any of these but trial and error is fine, if you plug it in wrong it just won't work.
* I assume you're talking about the tiny little front panel connectors that plug onto Motherboard pins. The motherboard will be marked.

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May 20, 2010 at 20:01:25
yes! i am talking about those cables... thanks for the reply. i been trying all ways but mobo seems to be dead or something... cpu fan does not start, nothing starts :/

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Related Solutions

May 20, 2010 at 20:58:58
I cannot guarantee any of these but trial and error is fine, if you plug it in wrong it just won't work.

Not for leds! Get the polarity wrong and they can burn out. The power and reset buttons are momentary switches on atx so polarity isn't so important for them.

Consult your mobo manual for pinouts.

I found the manual for the board in the newegg link here:

Here are the definitions(page 26):

Edit: Removed confusing rambling.

My money would be on what Bener posted for + - setup.

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May 21, 2010 at 03:31:24
thanks! i been reading that exact page and looking at that diagram but still nothing... no led lights, fan wont start, nothing will start when pressing the power button.. could it be a bad mobo? i checked all other power connections :.

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May 21, 2010 at 03:37:15
when i power on the power supply my mouse laser light stays solid red :/ at first i did have two solid red lights on my computer case .

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May 21, 2010 at 04:52:08
Power issues seem to plague motherboards these days, so I wouldn't be surprised if you got a dud. It could just as easily be a bad psu.

It's still worth triple checking power connections and making sure the cpu and ram are seated properly. If you have a known good spare psu I would suggest testing with it, if only to rule out a bad psu.

Other than that I can't offer much help.

I have seen the mouse issue before on otherwise working pcs, it could indicate some issue I'm not aware of.......

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May 21, 2010 at 04:57:36
okay... i did check all connections and tried a different psu.

I disconnected everything except,1 ram module, cpu fan, processor (ensured it was placed correctly on socket)

and of course the 2 psu power cables connected to the mobo, and my case power switch and reset switch cable. still no power.

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May 21, 2010 at 06:04:43
Looks like you may be out of luck :(

One last thought might be to connect the reset switch to the power connector and hit it, just to rule out a bad power switch. I doubt it would be but you never know until you try.

Other than that I'm out of ideas except for replacing the motherboard, maybe someone else can add something....

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May 21, 2010 at 06:05:15
turns out i might have a bad power supply and power switch (button)

I connected a different psu and touched the two power pins with my screw driver and the cpu fan started up.....

problem is i kinda f---ed up the case and I don't think i can get it exchanged :/

i'll see if i can find the receipt for power supply S:S

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May 21, 2010 at 06:11:36
32 seconds ;)

If you can find and old case you may be able to scavenge a switch/cable, they tend to all be the same style of switch inside. The tricky part tends to be getting the face plate off without breaking it.

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May 21, 2010 at 06:15:07
yeap... i was planning to buy another case like the one i currently have and get the part i need and replace it on the old one then go back and ask for a refund. it's just the front cover where the dvd drive goes to. I kinda broke it :/

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May 21, 2010 at 06:33:04
The virtues of thin brittle plastic, I have been there many time myself. Anyway I hope you get it worked out, sounds like a frustrating build.

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May 21, 2010 at 06:52:33
Referring back to your original post. If you can't figure that out perhaps you should not be building a PC.

The motherboard came with a manual which clearly shows what is what. The wiring from the case should be clearly marked with polarity, as well as what purpose they serve.

You should always bench test a motherboard BEFORE installing it in the case. What did you do to the case?

As far as removing the front bezel of a typical case goes, if your remove all the panels the retainer clip are all exposed and you should be able to see how to remove. This requires keeping a slight tension on the bezel while releasing the clips, one by one starting at the top.

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May 21, 2010 at 07:58:29
the case did not come with a manual that explain which cable is positive or negative.

issue is just the power supply.

The power switch ended up working with the other power supply I connected.

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May 21, 2010 at 12:43:50
the psu what works is only 350 W

I was wondering if this was enough for what i have.
I have 3 fans, dvd burner, 1 hard drive, 2 external hard drives, web cam, wireless mouse and keyboard, one video card (ASUS Radeon EAH4350 512MB DDR2), duo core processor, printer and that's about it.

My old computer only had a 300 W psu and I was using all 10 usb ports and it still worked fine.

I think i might just keep this one and return the 600 W power supply .

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May 21, 2010 at 14:48:08
There should be a + or - right on the connector.

The wattage rating of a power supply is just a rough guide.

Are you trying to swap out the guts of a Compaq Presario and install into a new case? If so, you may have propitiatory connections for power.

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May 21, 2010 at 15:19:48

I ended up buying everything so i'm just building a pc from scratch.

And there are no + or - signs on the cable connectors that come with the case. Only colors :/

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May 21, 2010 at 18:24:59
alright! finally computer booted up, inserted windows 7 cd and ready to install.

so far the installation speed is slow!! not as fast as I expected! might there be something wrong?

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May 21, 2010 at 19:02:25
o_O not again! now it won't power on again :/ it was working fine... might there be something causing the psu to blow out?

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May 21, 2010 at 19:03:39
Remove the board from the case and bench test it.

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May 21, 2010 at 19:10:03
well, what i did was to power it off and add another module of 2 gigs then it decided not to power on just like first time i started :/

removed the module and left the original in the same slot ... tried again no luck :/ _o_O

i'm going to test psu with computer i know works ...

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May 21, 2010 at 19:27:39
tested psu with another mobo and it works fine :/

now known working psu won't power on computer o_O

i'm confused now :/

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May 21, 2010 at 21:07:35
Sounds like capacitor issues or even cold solder(eww!).

My guess would be a failing capacitor(because they tend to cause intermittent issues), but that doesn't count for much because it/they could be on the motherboard or in the psu. Worse still, unless there is visible damage it's hard to test for or isolate.

I can't be sure of course, that's just my slant on things.

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May 22, 2010 at 03:59:14
f---! Alright I'll get another mobo and psu :/

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May 22, 2010 at 12:28:31
deep breath.... hooraaay! we are not online !!! i named it " pain in the ass" xD

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May 22, 2010 at 12:44:35
Did you try to bench test the board? I new board isn't likely to have bad caps.

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May 22, 2010 at 12:55:03
i did everything! and that mobo was driving me nuts! it would work then it stopped working. I ended up returning the mobo and getting a new one. The psu I got still did not work :/ it's 600 W I will just return it and hopefully get a refund. I am using a 400 W PSU i purchased long time ago.

Man ! this computer is blazing fast! so cool :D I'm happy now xD

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May 22, 2010 at 18:45:53
quick question...

what is the orange thing on the mobo below with the word
gigabyte for?

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May 22, 2010 at 19:22:03
Northbridge and heatsink?

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May 22, 2010 at 19:46:13
... and there doesn't appear to be a heat sink on the CPU. I hope you fitted one before you applied power, if not that could account for the intermittent start-up problems.


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May 22, 2010 at 19:55:13
oh! cool! so it's like another heat sink (permanently attached to

This pic is not my mobo. I was just wondering the purpose of
that part.

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