Plugged the 4 pin main connector into the ATX 12V connector

[kk29j]

Plugged the 4 pin main connector into the ATX 12V connector. The power supply I have has a 20 pin + 4 pin main power connector which I plugged the 20 pin where it should go and foolishly I plugged the 4 pin (not the ATX 12 4 pin ) into the CPU 12V connector. The computer started for 1 second then shut down. Realizing what I did I plugged the ATX12V connector into where it should go and the computer started up BUT could never get into the BIOS. Kept getting the RGB signal on the monitor saying there was no signal. Tried another video card and the same thing. Did I fry the motherboard?

 

[Modelworks]

Unplug the pc , clear the CMOS using the motherboard jumper.
See if that works.
If not are there any beep codes from the speaker connected to the board ?

 

[kk29j]

I tried clearing the CMOS did not help. Do not have my speakers hooked up so I do notknow.

 

[Modelworks]

You can try removing and re-installing the ram, sometimes the sticks can be finicky.
I would suggest getting a speaker connected to the connectors on the motherboard. There are beep codes that the bios makes that can help diagnose the problem.
The speaker is the one on the motherboard connector , not the place for like a sound card output.
Pic of a sample speaker connector, check your manual for yours.
http://www.data.sg/pics/front_panel_connectors.jpg

Beep codes for some boards, check the manual to see if yours are listed.
http://www.computerhope.com/beep.htm


This is like the speaker I use.
http://bestbyte.net/mm5/graphi...0000001/CACP01SP1L.jpg

 

[Zepper]

Actually what you did there is short one of the PSU wires to ground (the extra 4 wire connector on a 20+4 has +3.3, +5, +12 and ground instead of two twelves and two grounds), so you shorted the 5V to ground and the 3.3 to the 12V (may be different wires shorted depending on which way you forced the plug in). I'd be surprised if you didn't damage both the mobo and the PSU (but more likely the PSU). Haven't you been taught never to force connectors? The +4 connector shouldn't even go into the P4-12V socket w/o excessive force applied as the keying is different (for dummy proofing). Anyway, get your PSU tested or buy a tester. Newegg has a selection of testers from under $10 to about $30.

Perhaps you loosened up the P4-12V socket so badly by jamming the +4 plug into it, that you managed to force the correct connector into it the wrong way too... ;-) Let's hope your female friends aren't treated similarly... ;-)

.bh.

 

[Zepper]

BTW, MW, some mobos don't even have the pins for a case speaker any more, and many, if not most, cases don't come with a speaker any more either. Been holed up in your "economic catastrophe shelter" (i.e. cave) for a while already? I really hate it when they discard the old standard way of doing things just to save a few pennies. I don't buy a mobo that lacks the speaker pins and have stocked up on those "dongle" speakers. I need MORE Beep-Boops!

.bh.