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Computer starts then turns off again...

C

CraigKORE

n00b
Joined
Jul 24, 2004
Messages
9
Story so far....

Upgraded mother board a few weeks back and insalled new RAM, all been running fine. Ordered a new CPU and the Radeon 9800. Installed CPU the other night and it was working ok, but could not load up Windows XP, no problem, will just reinstall that once the 9800 appears. Put old CPU back in, all running fine gain and XP booting up. 9800 arrives today, install that and also new CPU at the same time, boots up computer to do a windows reinstall, comp starts for about 5 secs then turns off again!

I put the old CPU back in again to see if that was the prob, but same thing happened again, starts for about 5 secs then back off. Takes out the 9800 and put my old Geforce 3 back in, same again. Take out the PSU and put in another one that I know is working, still the same.

Anyone got any idea what the problem could be now? Was looking forward to a night of getting everything up and running and trying out my new card and CPU but 4 hours later I'm out of ideas.

Thing I have noticed, is that when the comp turns itself off, the green power light on the front stays on? CPU's are AMD 1800+ and my new 3200+.

Please - any ideas anyone before I go mad?
 
Just tried again and the computer stayed on a bit longer, got to POST and was starting to load up when it just cut back off again. Could this maybe be a mobo problem? Nothing is hot inside the case as far as I can see/feel. :confused:
 
sounds like you need more power that happened to my grandpas computer got a new but had a crappy psu and it did the same thing
 
I agree with rcf198 sounds like it doesn't have enough power to run.
 
Definitely sounds like insufficient power. How big are the PSUs you're trying, and what brand?
 
Sysjack said:
Definitely sounds like insufficient power. How big are the PSUs you're trying, and what brand?
Click to expand...
yeah, if you need a new one, i'd recommend one of the following:
Fortran
Enermax
Antec
 
Sounds like my problem at the moment. Mine will usually get past POST and start loading windows when it will reboot. Just had a bugger of a time getting into windows. Then I go to play winamp and it roboots. Once I get into windows, it is usually stable and can reboot with no problem.
Starting to think I need more power. Will unplug the last HD that I installed and see how that is in the morning. I did take out a cdrom but it is still doing it. It was running fine about a month ago and the only thing I can think of that I changed is either RAM [which I don't think is the problem] or I replaced a 60GB Hitachi with a 160GB Maxtor.

Tis getting annoying when it takes 5 minutes to boot into windows.
 
Thanks for the replies guys. Thing with the PSU's and lack of juice is that I put back in the old CPU and old graphics card and it was still having the same prob with turning off again when surely it should have ran fine as it did before. :confused:

The older PSU is a 300w unbranded, and the new one is a Q-Tech 550w.
 
I am sure that the heatsink has been seated properly through out all of this rigtht???

Also, is your heatsink rated for a 3200+?
 
yea, that would be my second guess. Your posotive your putting the HSF on correctly?

It could always be overheating too.
 
Paragon said:
It was running fine about a month ago and the only thing I can think of that I changed is either RAM [which I don't think is the problem] or I replaced a 60GB Hitachi with a 160GB Maxtor.

Tis getting annoying when it takes 5 minutes to boot into windows.
Click to expand...

That could be the ram. Slow opertation can be a sign of defective ram. Run memtest on it.
 
Sysjack said:
That could be the ram. Slow opertation can be a sign of defective ram. Run memtest on it.
Click to expand...

Ram was fine when I tested it after I installed it. System runs fast.. just reboots when I start up in the morning. I unplugged the power from teh 160GB and it booted first try this morning. I shut it down and plugged the power in and it was still fine which is usually the case once I get one good start out of it. Have not had it start right up in a while like it did this morning unless I left the power to the comp on all night [which I havn't done in a while so I don't know if that would still work]
I think it is PSU.. bummer. Didn't want to have to spend more money on this system.

Oh well.. worry about it later. More important things to do.
 
I just started getting this exact problem craigKORE describes.

Plug in new power supply to new Mobo, shuts off after five secs. Try new power supply with known good system, same result. Put previous power supply back in known good system, still shutting down after five secs.

New power supply is 480W Thermaltake, old was-known-good is 380W Enermax.

craigKORE, had any luck fixing this?

-- Phil
 
Some detailed system specs could help us out a little more philgross. You could be running like 7HDDs and the 380 watt PSU can't handle them, and the 480 is a lemon...
 
Sure. Known good system is Leadtek WinFast K7NCR16 mobo, Athlon XP 3000+, two 120GB drives, two optical drives, Audigy, Promise ATA RAID card, 2x512MB RAM, Radeon AIW 9700, and the Enermax 380W power supply. It's been stable for quite a while.

New system is pretty similar to the Ars Performance box, although the problem appeared before I had installed almost anything. MSI K8N Neo Platinum mobo, Thermaltake Silentpower 480W, A64 3400+, 1GB RAM, eVGA 6800GT is all that was installed when it refused to stay up for more than 5 secs. With the 380W installed, it would stay on, but the MSI diagnostic LEDs is still stuck on all red, indicating CPU problems.

My current thesis for the problems with the older system is that when I swapped power supplies, I jiggled the cooling system loose from the processor, so now I'm getting thermal shutdown. I'll be removing processor and cooling, reapplying thermal grease, and reseating today, to see if that helps.

-- Phil
 
yea, if your motherboard is indicating CPU problems I think your correct to check that out 1st. But 5 seconds... isnt that a bit fast for thermal shutdown? Or do they actually heat up that fast?
 
pbXassassinX1524 said:
yea, if your motherboard is indicating CPU problems I think your correct to check that out 1st. But 5 seconds... isnt that a bit fast for thermal shutdown? Or do they actually heat up that fast?
Click to expand...


They sure do heat up that fast.
 
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