motherboard will not power up 2

[jemminger]

hi all,

just changed the motherboard in my machine to a pcchips w30 with amd xp3200 or thereabouts, was a friend's old mobo and he said it should work fine.

i've hooked everything up and i'm 99.999% sure i got the front panel leads in the correct positions according to the manual. the problem is that the power switch does absolutely nothing, nada zilch.

the power supply is a brand new 450w rosewill... i do get a single red led lighted next to the processor, which my friend said means all components are installed correctly, though i can't find any documentation on this.

the previous mobo powered up fine with same PS, but would not post, which is why i tried switching.

any help would be appreciated



-jeff

http://www.jeffemminger.com

lost: one sig, last seen here.

 

[edfair]

Time to pull it out and try it on cardboard using a screwdriver blade as the start switch.

You can have a fried M/B, P/S, or video along with several other things that will possibly not be involved with it out of the case.

Ed Fair
Give the wrong symptoms, get the wrong solutions.

 

[ThatRickGuy]

If nothing happens when you hit the power switch I would guess one of 3 items:

1) Power switch is hooked up in correctly.
2) Power supply is dead.
3) Motherboard is shorting and is preventing power up.

#1 is the easiest one to mess up on and fix. #2 isn't too likely as it sounds like you've been using the case with out problem. #3 I've seen a handful of times, usually someone forgets to put the brass risers in under the MB and they wind up screwing it straight to the support board. That causes shorts on the back side and the MB will refuse to power up.

If you are positive on #1, try what edfair suggests, set the MB up on a sheet of cardboard and plug everything in. If it powers up correctly there, the problem is likely the board shorting when it was installed in the case.

-Rick

VB.Net Forum forum796 forum855 ASP.NET Forum
I believe in killer coding ninja monkeys.

 

[edfair]

Starting point on cardboard shuld be with the bare minimums. then you can start adding anything else that will work with the cardboard.
If it works with the cardboard you shove it back in the case with the same parts that were working outside and start adding things till it is fully populated or craps out.

Ed Fair
Give the wrong symptoms, get the wrong solutions.

 

[jemminger]

thanks guys, i'll give this a shot

-jeff

http://www.jeffemminger.com

lost: one sig, last seen here.

 

[theniteowl]

jemminger, I have had similar issues with a PCChips MB.
If there are jumpers or dipswitch settings on the MB to control the BUS, FSB or memory speeds make sure they are all set correctly.

Some power supplies have an additional 4 pin connector that plug into the MB, particularly for Intel processors so make certain that is connected.

The power switch is just a latching switch that causes a short between pins 1 and 2. If you know you have the right pins on the motherboard for the power switch you can (as edfair mentioned above) short those two pins (careful not to short anything else) with the tip of a screwdriver to test it.

Make certain the CPU fan is properly connected, some MBs will not power up without it.

Unplug ALL cards connected to the system as well as any front panel connections for USB or audio ports. If you installed an AGP card designed for a lower bus voltage it could cause the problem or if a card skews in it's slot enough to short it can cause this. If you have a bad USB port it can cause it to fail.

Essentially, unplug everything external to the MB except the power supply and see if it spins up. If it does, start adding things back in and see if it continues to work with each item. Put items back in in this order: Memory, AGP video card, master hard drive, floppy drive, PCI cards, remaining drives, external connections such as firewire, usb, audio, etc.



It's hard to think outside the box when I'm trapped in a cubicle.

 

[paparazi]

This board has a second power plug behind the main plug (12volt) that has to be connected.
Also not correct orientation of the heatsink (the recess in the base of the heatsink must be positioned so that it locates over the cam box on the CPU socket otherwise the heatsink will not sit squarely on the core resulting in instant CPU overheating and poss permanent processor damage.
Thermal paste must be applies to the small raised CPU core
CPU fan wire to fan header connection, double check
Some PCchips boards come with cmos jumper set in the "clear position" check
Are any fans spinning?
Martin




We like members to GIVE and not just TAKE.
Participate and help others.

 

[tifius]

if you had forgotten the lite brass things behind the motherboard your board would have fried, or so many others have. so i think you can rule that one out.

 

[jemminger]

update: it's working now - i pulled the heatsink off the cpu, took the cpu out, dropped it back in & reinstalled the heatsink... starts right up now ?!?

thanks everyone

stars to edfair and rick for suggesting i pull the mobo out and try it alone - i verified the PS was fine by hooking it up to the old mobo this way.

-jeff

http://www.jeffemminger.com

lost: one sig, last seen here.