please help Pc powers up then off

[neotech]

Help my new pc worked fine a week ago, but now when I turn it on it stays on for 1 second and then switches off. The fans all work before turning off, but can't figure whats gone wrong, please help.

TIA

 

[rutchtkim]

did you try switching out ur current power supply?

 

[Regs]

Sounds like the heat sink on your cpu must of moved or dis-latched itself. Make sure the Heat sink is perfectly secure and flat on the cpu.

 

[neotech]

Yeh it could be the power supply but its brand new I can't see why it would just go, its a antec truepower 380w. The heatsink on the cpu is fine, clamped down like a rock. The pc kicks in sometimes for no reason, kinda rules out the psu but it could be that, i think the psu is going into overload mode or something but i can't figure what may be shorting it out. Its driving me nuts and I hate returning things and then waiting ages for another, bought online at dabs.com.

 

[WarCon]

Is there a fan plugged into the CPU fan header?

 

[neotech]

yep the cpu fan is plugged in, the mobo doesn't even kickstart when I short the soft on pins with a screwdriver, either the mobo is screwed or its the psu, may have to RMA both of them, unless ive missed something but ive double checked everything, waited ages to buy a new system, typical pc crap!

p4 2.4c
msi 865pe fisr
256mb crucial 2700 x 2
sata seagate 160gb
antec truepower 380w

ps did i buy the right springdale mobo? if i have to rma I could swap for an asus. Is the asus better than msi? msi throw in so much extra stuff and that fan light on the northbridge is cool (if a bit loud!)

 

[Regs]

Hm. You are using ram rated for a 333 Mhz bus. If I'm correct, then you need at least RAM that can support 400 Mhz for that 2.4c . I think you killed your RAM.

Duel channel 865pe, get 2x PC3200 or above rated for at least 400 Mhz FSB. The only thing you need to RMA is the RAM if it's not all ready toasted.

 

[mechBgon]

It could be the RAM's dead, or maybe one of the two modules, but I wonder if it could be an electrical short, too.

Look at the ports on the rear of the case and make sure that none of the springy finger things got into your USB or network jacks back there. If they did, pry them out carefully (this could be causing a short). Also, if your case's front-USB wiring is plugged into the motherboard, unplug it for now.

Next, make sure all your cables, cards and memory modules are fully seated. Particularly make sure the 4-prong auxiliary power plug is plugged into the motherboard.

Now reset your CMOS using the method described in the manual, and see if it gets going now. If it doesn't, unplug all drives from power and data cables, pull out any add-in cards you don't need, and try starting the board with one memory module at a time.

The manual indicates that any of the four slots can be used in single-channel mode, and for dual-channel mode with two modules, install them so there's one empty slot between them. The modules should be completely identical for DC operation.

Welcome to the Forums neotech, hope it works out for you

 

[neotech]

Thanks for all your help guys your a gr8 bunch of people, will try all that you have suggested and let you know how I get on.

 

[neotech]

you were right mechbgone there was a springy metal thing on the back plate touching the keyboard controller and causing the short, the pc fires up now, cheers! but there is no display, wats gone wrong now, is it the memory? but the pc doesn't beep or anything just no display on the monitor