my computer wont stay on.

October 23, 2010 at 14:57:11
Specs: Windows Vista, Intel dual core 2.13 w/3gb ram
The computer will boot up and load windows just fine, then run for anywhere between 5 seconds and 5 hours. Suddenly the power will shut off, as if out of nowhere. The power button LED comes back on, along with the psu fan and the vid card fan. I can also hear the HDD spin up like it is starting to load, but there is blank screen and neither the cpu or chassis fan are on. I have to hold the power button for it to shut off, then try 2-3 times to get it to come back on (sometimes when i turn it back on i get the same result with no cpu/chassis fan) and if it does come back on to boot up sometimes it will make it all the way into windows and sometimes it won't. First I thought it was a power failure, so i got another psu even tho i have a tester and it passed. I systematically unplugged every component (even all the ram at one point) and still the computer would not stay on even in the bios. I have speedfan to monitor voltages and temps and it does not seem to be getting too hot according to those temp readings.
Everything is connected/attached securely. There are no blown capacitors. I have swapped the cpu with another known good cpu, same speed, only version 6420 instead of 6400.

Really i guess the only clue i have about what is going wrong is that once it shuts itself off, when it comes back on only some of the board is powered up, for example, I will have vid card fan and psu fan and hd activity, but no lights on keyboard and no running cpu fan or chassis fan. tried bios updates, driver updates (when it was staying on) Maybe i just need to trash the MB but i don't have another. Maybe I am applying the thermal compound wrong or I need another kind? If there is anymore info you need just ask and I will see what i can do.

i have a gateway gm5454e Win Vista
motherboard is intel dg965OT
power supply viotek 800watt-brand new
cpu intel core 2 duo 2.13 6400 and 6420
3 gig ram
using nvidia 6600 gt from pny
(which is not the card that came with it)
also tried just running on board graphics with same result.

tried disabling that and using onboard video instead, no change
we have tested all the components
put in the new power supply
tried 2 different cpus- good working on other comps
used formula 5 silver thermal compound from

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October 23, 2010 at 18:51:14
Did you thoroughly remove the old thermal paste first ? How much of the new thermal paste did you apply ? Look at
for the correct way to apply the thermal paste. It does sound like it could be the mobo, though.

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October 23, 2010 at 20:03:12
just curious, what are the temperatures your getting? (when under load and idle)

when it is having these issues, can you try to view the temperatures in the bios? (they may not be listed in the bios...)

I'm back! (from a looooong time ago)

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October 23, 2010 at 20:34:09
the idle temps
(from speedfan)
core 0 - 26c
core 1 - 27c
cpu die - 35c
2 sensors on the board are 39 & 41c
ich is 76c
mch 46c
gpu 44c

these are idle temps with cover off. I checked out the link on the thermal paste application and i may be doing it wrong. Another thing i may be doing wrong is the installation of the heatsink, because it is spring loaded and I assumed it should be screwed down tight for the springs to keep pressure on it, but im thinking maybe it is screwed down too tight and warping the board so the chip isn't making good contact. Thanks for the tips and I will report back the results of my thermal paste re-application.

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Related Solutions

November 16, 2010 at 23:01:41
I think I just inherited a lemon,

I verified that there were no hardware problems, the paste is being applied properly, cannot find any error logs in windows or the bios, no blown capacitors. Reinstalled vista, all the drivers, new mouse, new keyboard, new monitor, new cords, just in case. I also put in a new hard drive. I have tried adjusting the screw tightness on the heat sink, it is spring loaded. I have tried thermal grease. It is still doing the same crap where the power supply fan is running, the other fans come on for a second and then turn back off, the computer will not boot when the fans turn back off. Sometimes the fans stay on and the computer boots, but then then the computer shuts off within 10 seconds to 4 hours. Today it was 40 degrees outside, left the computer off all day with the room ice cold, still having the same problems. The temps are running cool when it does boot. temp does not appear to be a problem. Keeping the dang thing turned on is getting to be rather frustrating. Would a faulty power switch cause it to turn off like this? That is the only thing I haven't tested because I do not have an extra one at this time to test out. Something else I found odd was when I loosened the screws it still turned on, but when I took them out completely it would not turn on at all. So I put the screws back in again and it turned on. Could the screws be somehow causing a short?

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November 16, 2010 at 23:02:50
This is JB69s wife BTW, I am playing secretary while he fiddles with his machine.

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November 17, 2010 at 00:40:10
I have a new update

now when we push the power button nothing happens, the motherboard light is on so we know it is getting juice. he took apart the power switch, checked out it guts, and put it back together. The machine turned on for about 15 seconds and then went back off and wont come back on now. If it stills does this nonsense after we buy a new switch what should we look into replacing after that? we have pretty much run out of parts to trade out. Aside from the motherboard itself. He went and looked at a diagram for the motherboard and all the switches and things were in the right places. He understands that stuff better than I do, sorry I can't be more detailed.

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