View Full Version : no power???
06-12-2003, 06:48 PM
last night my computer just wouldn't turn on anymore.....i tried plugging it into another outlet to see if that was the problem...but nope didn't work!!!:confused:
then i went out got a new power supply 300w...to replace old 300w...and it still is not turning one....
what i noticed was that when i plugged the computer and turned the power on....the whole entire computer is not turning on...but there is a red light that comes on in the motherboard....
I really don't know what is the problem...it is not the outlet....not the power supply... what else....
there is a small round battery (one of those small flat ones on the motherboard) could that be what needs to be replaced??:confused:
this computer is about 3 yrs old
06-12-2003, 08:44 PM
Hi racerxsv, and welcome to the forums at http://www.pcguide.com/vb/index.php?s=.
If you hit your power switch and absolutely nothing happens, it's most likely one of three problems.
The first possibility is your power supply. You've replaced that, so move on to...
The second possibility is the on/off switch. The way to test that is to follow the two wires that come from the switch to the motherboard, pull them out, and bridge the pins they came off of with something conductive (like a flathead screwdriver). If that starts the system, then the switch is bad. But you did say that something was happening. You see a little red light on the motherboard? It's prolly not the switch then. I'm curious to know what that little red light is, but it's prolly not important in diagnosing your problem. Move on to...
The third possibility is a bad motherboard. No really good way to test that outside of replacing it. What you can do, though, is rule out all other small possibilities by trying a minimum bootable configuration and making some observations. If you've got onboard video, remove all cards. If not, remove all cards except for your video card. If you've got more than one stick of RAM, get yourself down to one. Unplug all drives and all peripherals including your keyboard and mouse. Try turning it on and see what happens. If it boots, start adding things one by one until it fails to boot again.
The wildcard is the CPU fan. Is it spinning when you turn it on? If not, that could be what's stopping the boot process. But don't try to boot without it - you could fry the cpu.
06-12-2003, 11:29 PM
I posted earlier:
The third possibility is a bad motherboard. No really good way to test that outside of replacing it.
What you can do, though, is have a look at some of the links in this (http://www.pcguide.com/vb/showthread.php?s=&threadid=21744) thread and check your motherboard for bulging or leaking capacitors.
(And of course, what I meant in that first line was welcome to the forums at http://www.pcguide.com/ubb/pcgubb.gif. :rolleyes: )
06-12-2003, 11:50 PM
that light on the motherboard may be important. My mother board uses three onboard lights. Yellow to indicate the motherboard has power green to indicate the system is switched on and red to indicate activity on the power/reset switch lines. All three lights are lined up side by side for easy viewing.
06-13-2003, 11:12 AM
Good call, pave_spectre.
racerxsv - got a manual for your motherboard?
06-13-2003, 12:22 PM
Hehe...had me going there pent! :D I thought, "What's he up to?" I figured you were going after the logo (http://www.pcguide.com/logo.gif) and missed! :(
06-13-2003, 12:36 PM
I will try all the suggestions tonight...
I don't think it is the power supply...because I changed it...
I think the red light on my motherboard indicates that the motherboard is getting power or something....i don't know:(
the thing is....when i het the power button....you see the hard drive light on the case flash for a mere 100th of a second and that is all....nothing runs....you hear no noise...only the noise of your finger pushing the power button!!! well actually that noise and the voice in your head telling you to just throw the whole computer out the window!!!:eek:
i hope it works.....
06-16-2003, 12:36 PM
Double check th wiring connections.....that flash of LED sounds about how long it takes for the power switch to make contact.
01-19-2006, 09:43 PM
im basing this off a hunch of my own computer but...
you might not have enough wattage going through your computer. my computer is doing the exact same thing as i have a 300W p.s. but i have so many things in the PCI and AGP slots that its being run dry all the time. i got a dvd drive and put it in and tried to turn on the computer and nothing would happen. i also noticed before i tried plugging in the drive, the computer has been acting strangely and restarting randomly. maybe urs is like mine and being overwhelmed.
check this site out and see if it describes your symptoms
my motherboard has a light on it too to indicate theres power going through it and i read that that means for most boards that its not fried. (but it could still potentially become fried if you keep trying to use a weak power supply) just because you replaced it with another power supply doesnt mean it will work. if its the same wattage and its still doing this then you need a larger power supply
do you have a ton of stuff plugged into the p.s. or motherboard? like tons of hard drives or PCI's?
01-20-2006, 02:44 AM
You might want to double-check the date here. This thread is from summer of '03! :eek: I suspect some sort of resolution (one way or another) has been achieved for this specific problem.
Your advice was good, but try to find more recent problems to help solve. ;)
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