Solved Computer turned off suddenly, now doesn't turn on

[linnemeyerhere]

praeambulus,
Sounds like everything is pointing to two possibilities, your PSU or your GPU. Does the mobo have graphics on board? if so you can remove the 9800 and moving the monitor cable to the mobo output, test it. If the video comes back then it will be the graphics card and it'll be time to shop for a replacement. If no joy with that then I would then check the PSU.

 

[praeambulus]

@TVeblen
i started the test as u told..yes there were beeps.no memory i guess.but the problem is not gone.still the pc turns off.and on..what can i do now?

 

[praeambulus]

i don't think the motherboard has video onboard.but im not sure.it's GA-EP43C-DS3.and my graphics card is gtx560ti.thanx for the reply

 

[FaberTech]

got to get some sleep. just make sure your cpu heat sink is in place. just in case you missed that post. you can always go get a cheap multimeter if you want to check your power supply. there is tuns of step by step instructions on how to do it. good night all. looking forward to the conclusion on this one.

 

[praeambulus]

the heatsink is in place.thanx.good night

 

[TVeblen]

When you did the diagnostic test, did the PC react just as predicted through each step?
You would have got the "no memory" beeps, shut down, added one stick of memory, started up, got a different beep code meaning "no video card", shut down, added video card, started up, and got a BIOS screen and could enter BIOS if you wanted.

If everything did not go exactly as above, where did it stop (differ)?

 

[praeambulus]

so shutting down would be normal? I did it 4 hours ago..but i dont remember if it turned itself on again.it did beep (beeps with little intervals) but i didnt do the second step..i'll do that in the morning and post the result.thank u

 

[TVeblen]

Yes, until you get into an OS (Operating System - like W7) the computer will not do anything automatically. You have to use CTRL-ALT-DEL, or the RESET button on your case to restart the system manually. To SHUT DOWN to add/remove parts you just push the POWER button on your case.
In a pinch you can even switch the power off in the back of the power supply. The BIOS does not need to "shut down properly" like an OS would.

Just remember that the purpose is to test the major components of your system to see if you can isolate the offending part. You always shut the computer OFF and disconnect the power before working inside your machine (adding or removing parts).

You turn the computer on after each replacement just long enough to test for the expected outcome, then manually shut it OFF again to do the next thing.

Pay attention and note what happens as you add the parts back. You can report here what the beep codes were (3 short, or 2 short - one long, etc.) if you want an explanation.

If the diagnostic process does not go exactly as I posted previously (post #14), then note what happened differently and let us know here.

 

[praeambulus]

i have removed everything except cpu and mobo itself(removed ram sticks)..i get beeps with short intervals and the pc turns off (9 beeps, but i think it goes on if the pc wouldnt turn off)..and the annoying part is that the pc still turns itself on again.so the problem isnt gone :/

 

[FaberTech]

did you get a new battery yet?

http://www.5starsupport.com/info/beep_codes.htm

according to that site, most everything is pointing to the bios. but you should look and see for yourself.

 

[praeambulus]

no.i'll get it soon if i find.our comp stores suck..and how do i know what bios i have? Looks like its IBM BIOS..but not sure

 

[praeambulus]

ok.i changed the battery and tested.same thing.it's not the battery

 

[FaberTech]

did you hook up the ram again after changing the bios batt?

 

[FaberTech]

Make sure that you removed the battery placed the cmos jumper to the reset position, hold down the power button, and have absolutly no power running to the motherboard.

The only other thing i can think of before assuming something like the power supply, cpu, ram or motherboard is shot, is to remove the cpu and put it back in again. but you would need liquid silver for that. they got that stuff at radio shack as do they have batteries as well.

 

[FaberTech]

do you have the model of your board?

 

[praeambulus]

no.i didnt hook up the ram.whats the point.the pc still turns on and off..theres no jumper near the battery..about the cpu.i dont want to that that.i dont think thats the problem.and have no experience in this.thanx for the suggestion though

 

[praeambulus]

yes.it's GIGABYTE GA-EP43C-DS3

 

[FaberTech]

http://www.manualowl.com/m/Gigabyte/GA-EP43C-DS3/Manual/208050

page 25 tells you how to change the battery

page 31 tells you where the jumper is and how to do it

page 87 tells you what the beeps mean. it is the bios and may be corrupt in witch it is not worth fixing. you would just have to replace the board.

for everyone else, this is what this thing looks like

http://img28.imageshack.us/img28/7360/img0053ad.jpg

a jumper looks like this

http://www.usbmemorysticks.net/wp-c...nized-2/8-usb-power-jumper-on-motherboard.jpg

if you don't have one, you might have one on the back of your hard drive and/or dvd drive you can borrow.

 

[praeambulus]

i dont have a jumper.but i touched the pins with a screwdriver.same result.and about the beeps.seems like the beeps want to tell that theres no gr. card installed..power problem beep and gr. card are similar.should i install the card and test?

 

[FaberTech]

sure nothing hurts at this point.

I was under the assumption that you had 9 short beeps which is a bios issue. but if you have another thought, the more the merrier.

P.S. i would put the ram back in. refer to the instructions on which slots to insert them in if you don't have a full four sticks.