I have got a new PC a while ago, built it and turned it on. The CPU Fan starts then shuts down immediately. I know the CPU (P4 3.0GHz) is connected correctly because the levers are down and everything. I tested the power supply on another computer and it works fine. I figured it must be the motherboard but I'm not sure. I got the right kind of memory but the brand name was not listed on the list of memory that was printed in the manual. Anyone have any suggestions? If you need more info I'll post it up.
What exactly is the problem?? Is the CPU fan stopping the only thing wrong? What exactly (in order) happens when you try to turn it on. Also, what type of motherboard do you have?
I push the on switch of the case, the CPU Fan starts along with the power supply lighting up. Then as soon as they both start, they shutdown. Motherboard: ASUS P4S800 - http://www.newegg.com/Product/Product.asp?Item=N82E16813131462
Has this ever worked? Did it just start doing this or this a new build? Does your MB have the 4 prong connector for the PSU? Is it plugged in. Maybe a short somewhere.
Maybe numberman will show up and have some insight.
its never worked. I thought i blew the first CPU cuz the levers weren't down. So i bought a new CPU and put it in with the levers down - same thing (my dads gotta build a new computer though so i didn't waste money on 2 CPU's haha). The 4 prong connector is plugged in.
I've seen this once before, and it was due to an improperly seated ATX connector. Killed the motherboard as a result. First off, unplug the power and reset swtich headers and jump the two power pins manually (anything metal will work). It's an instantaneous thing, so just bridge the two. I suppose it's not beyond the realm of possibility that one of the switches has a short in it. If that doesn't work, then my best guess is a short somewhere. Take the mobo out and put it on a piece of cardboard. -Reassemble a barebones there (mobo, CPU, video card, RAM) and try it again. If it works, then you probably have a standoff where there shouldn't be one in the mobo tray. Check, rinse, repeat if necessary. -If that fails, try a different PSU with the same mobo/CPU/RAM/GPU. Success here indicates a bad PSU. Replace. -If the above fails, things might get more expensive, because you'll need another mobo to test the other components on. If you can verify that the CPU, RAM, and GPU are all ok, then it's about 90% certain that you've got a mobo problem.
At this point it sounds like you should just try to RMA the motherboard... its safe, and its free.
thanks for all that info, i will try all of that until it works, i really appreciate it. One more thing, what do you mean by "two power pins"? completing the curcuit between power and ground?
That're referring to the front panel connector. It's usually located along the bottom of the motherboard, a set of pins organised into two rows, each with maybe 10 pins in it. It's the headers that you plus the power and reset switches into, as well as the HDD activity and power LEDs, and (usually) the front speaker as well. At any rate, the two pins that you plug the power switch into only need to be jumped once to turn the computer on, and you can do with with anything metal: plier tips, a paperclip, a screwdriver... whatever. At any rate, doing that manually just removes one possible problem source from the system.
I had the same problem. I turned on my computer, it would turn on, then immediately after turning on, maybe 2-3 seconds later, it would switch off. I bought a new power supply, I needed one anyways, it wasn't the problem. I sent it to a shop in my town, because I know nothing about computers, or at least how to set them up, which is where I got my PSU installed. They tried to turn it on, the processor was out of place, or not in the slot all the way, so they plugged it all the way in. They tried to turn it on, again, it did the samething as before. Eventually they took out my graphics card, and replaced it with some a cheap PCI-E card and it worked fine. I have yet to order another GPU, so i'm not sure if this is the problem, either. Though, seeing as the cheaper PCI card worked, I assume it is/was the problem. Hope this helps, but I am not 100% on this seeing as I wasn't the one fixing it. This might be of help, or it might not. Good luck fixing it.