System shutting off after 10-45 seconds

[ericb]

I have a system that I thought was having heat problems. The inside temp was around 100-110 F and the CPU was reading 150 F at full load. After running like this it would just shut down especially in CPU intensive games. So I swapped some fans, moved a more powerful fan to the front for intake and cleaned the CPU heatsink/fan and put new arctic silver on it. Now it is at the point of running around 30 seconds and then cuts off. I have to switch the manual power switch on the power supply before it will come back on. The system shows power when it shuts down (the motherboard LAN light is on and the power light and num lock lights stay on but nothing else. So now I'm wondering if it's a power supply problem after all.

Specs:
NForce 2 board, retail Barton XP 2500+, stock retail fan
1 GB DDR
1 CD burner, 1 DVD burner
2 Western Digital 7200rpm 80GB drives
4 system fans
Geforce 4 Ti4200
Antec true 430 power supply

It cuts off even if Windows doesn't boot...I've been going into BIOS to check the system health and it cuts off then. The power is reading:

Vdd 1.6
VCore 1.64
VDimm 2.62
+5 4.91
+12 11.85
-12 -12.03
-5 -5.04
VBat 3.10
5Vsb 5.56

The temps have been better while it's running anyway. The CPU is getting to around 110 F and the inside temp is around 75 F before it cuts off (obviously around 30 seconds). CPU fan and video on board fan are both working.

Right now I don't have anything plugged in except for the motherboard, video, 1 intake and 1 out blowing fan. Disconnected all other items inside and it still powers off. Nothing new has been added in about 3 months.

Any ideas? Does it sound like a power supply problem? Or CPU/MB? Any way to really test it? I do not have a spare power supply right now.

 

[InlineFive]

You call that cool? That's processor is running at 65c! Most boards shut off the processor at that temp!

1. Make sure there is no major dust on the heatsink.
2. Make sure the heatsink is installed the right way.
3. Make sure the fan(s) are running at full speed. Don't have them on the fan channel that the TruePowers have.
4. Get a case with better airflow! 38c is way too hot for most of those components!

-Por

 

[ericb]

I don't know...the BIOS turns off at 165 F. Anyway the normal running temp for the CPU is 130 F and only 150 F when it's been at 100% load for a couple of hours. I did clean the heatsink and put a new layer of arctic silver on already.

None of that matters right now anyway...it's not running long enough to get hot. The last reading I'm getting off the CPU before it shuts down is 110 F. There was a dust problem (now cleared) and I also moved the more powerful fan to the intake side so the interior should be better. So any ideas now? Could it be power related or CPU/MB?