Help. 24 pin Mobo issue?

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K

KyleGates

Senior member
Oct 19, 2004
613
3
81
Ok, so I am SURE I know the issue but I still have a problem.

I have a machine with an ASUS P5N-MX motherboard. Up until now it has always used an 8800GTX as the video card. Today I popped an ATI HD5770 in (After wiping clean all nvidia drivers and such).

After doing so, the machine will stall during boot with the ol "Hit F1 to continue or Delete for setup". Hitting F1 skips the screen at which point the pc boots fine. ATI Drivers install fine. However, as soon as the card is utilized near 600mhz (core) the PC shuts down instantly. (Used MSI Afterburner to test this). I have updated the BIOS to the latest version and done a BIOS reset.

After a little hair pulling I realized I am hooked up to the board with a 20pin power connector (when the board has a 24 pin). So, I am guessing I need a 24pin PSU or at least and adapter. The only problem is the only adapters I seem to be able to find are th OPPOSITE! 24 pin to 20, when i need a 20 to 24 pin. Is this my issue and is there such an adapter or do I need an entirely new PSU?

Thanks for any help offered!


CPU- P4 D 3.4Ghz
Mem- 2GB Gskill DDR-800
PSU- 500 Thermaltake Purepower
GPU- ATI HD 5770
 
BoomerD

BoomerD

No Lifer
Feb 26, 2006
65,921
14,313
146
I'd say you need a new, better PSU. Thermaltake units are marginal at best anyway...
While 500 watts SHOULD be plenty for your build, yours is probably just not up to the task at hand.

My recommendation would be to buy one of the following:
XFX
Corsair
Seasonic
Antec.
 
K

KyleGates

Senior member
Oct 19, 2004
613
3
81
Wow...with 33k posts I HAVE to listen to what you say right?! LOL.

Anyhow, I may look into it but I was pretty sure Id have more than enough power for the modest system. In addition I have had very poor luck with XFX in the past.

Funny thing is, I have a couple Antecs around in the 500+ watt range but again they are 20 pin connectors not 24.
 
K

KyleGates

Senior member
Oct 19, 2004
613
3
81
Well, grabbed an adapter. Same trouble.

So I swapped the Thermaltake for a 500w Antec Basiq ($20 Craigslist).
http://www.newegg.com/Product/Produc...82E16817371004

Now, it gives the same "error cannot boot" message, but when i skip it and it gets into Windows (XP), it seems to run fine now. Ran a few runs of 3DMark (06) and all seemed fine. Running a lil GuiMiner to stress it some but so far so good.
 
W

Wanescotting

Diamond Member
Feb 4, 2004
3,219
0
76
My guess is that the 12v rail(s) on that power supply (the thermaltake) cannot meet the demands of that particular video card (you did plug it in, right?).

Use the following as a reference.....Find the 8800gtx and the 5770, see the 12v rail requirement difference? (note that this is for single rail power supplies, but still applies)
http://forum-en.msi.com/index.php?topic=104805.0;wap2
 
Last edited by a moderator:
K

KyleGates

Senior member
Oct 19, 2004
613
3
81
"You did plug it in right?"

HOW DARE YOU ASK THAT!! Oh wait.....made that mistake on several occasions LOL. Yeah, did plug it in. As for the reference post you pointed me too....THX! Quite helpful.

Still dont know why I get that odd boot error but seems to indeed run fine...for now.

Thought maybe the bios was still pointed to the onboard video but I set it to PCIex and still..."error cant boot...reset to defaults or f1 to continue"
 
W

Wanescotting

Diamond Member
Feb 4, 2004
3,219
0
76
KyleGates said:
"You did plug it in right?"

HOW DARE YOU ASK THAT!! Oh wait.....made that mistake on several occasions LOL. Yeah, did plug it in. As for the reference post you pointed me too....THX! Quite helpful.

Still dont know why I get that odd boot error but seems to indeed run fine...for now.

Thought maybe the bios was still pointed to the onboard video but I set it to PCIex and still..."error cant boot...reset to defaults or f1 to continue"
Click to expand...

I asked because I erm, did that 2 days ago LOL I just finished my new WC build, and I was in a hurry. I turned the system on, and NO VIDEO....I thought I fubar'd the video card......about 5 minutes later I found my folly :)

I am not sure about the boot error, have you tried reseting the cmos? a hassle for dure, but worthit. Go into bios and "load defaults"
 
K

KyleGates

Senior member
Oct 19, 2004
613
3
81
Yep reset to defaults. Reset with jumper. Reset with removal of battery. Nuthin.

Lost power last night and this morning it was hysterical......the thing started like a lawnmower would!

I hit Power...nuthin.

Hit er again to see if I had just not pressed it....started for a sec.

Thought that was odd, checked the connections, hit power again.....started up, fans got going, five seconds in, shut down again.

So I tried the choke (flipped the PSU switch ta off, hit power to remove remaining juice, flipped PSU back on)....and hit power again and she fired all the way up and running fine again now. This is one WEIRD pc I have constructed here.
 
J

jcniest5

Senior member
Jun 2, 2005
368
0
76
Believe it or not, but sometimes there's the incompatibility between a MOBO and a video card...that may also be a possibility.
 
K

KyleGates

Senior member
Oct 19, 2004
613
3
81
VirtualLarry said:
Replace the CMOS battery.
Click to expand...

I think I have finally narrowed it down to a bad board. I have swapped every part at least once and have now even replaced the CMOS battery. When powered up, the system will run (fans spin etc) for a few seconds then....dead. If I unplug the ATX 12v (2x2) power from the motherboard, and power it up (With just a CPU and memory....video onboard)...the fans will all spin but it wont boot (obviously). Re-plug the ATX 12v and back to a few seconds, then dead.

This is with the board out of the case sitting on a shelf (hell..was beginning to think it was touching the case or had some other oddity inside there).

Only odd thing to me is that the board looks just fine. All the caps look good as does the rest of it (its an ASUS p5n-MX)
 
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MTDEW

MTDEW

Diamond Member
Oct 31, 1999
4,284
37
91
Take out the memory and try to boot and see if you get a beep error code from the board, if so, the board may not be bad.
If it beeps, i'd try removing cpu and reseat it and heatsink.

And try this, unplug all psu power connections to the board, wait 5min, then plug the psu connections back into the board and see if it boots.
Had a board that would do that to me once, and i'll be darned if i remember what i did to fix it.
 
K

KyleGates

Senior member
Oct 19, 2004
613
3
81
Swapped memory, and have tried several times with no memory. Just fires up for 2-3 secs, then dead. Every time power is cycled. Tried unhooking everything for an hour and going back. Same thing. So weird. tried different CPUs, HSFs, with mem, without mem, reset cmos every way you can, replaced battery (twice).

I just wish the board LOOKED bad at this point so I could have some closure LMAO
 
MTDEW

MTDEW

Diamond Member
Oct 31, 1999
4,284
37
91
Well that sucks.
R.I.P.

I could be something stupid like one of the traces inside the mobo layers broken and you'd never be able to tell.
 
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