At home I have a strange thing. I bought a new Power supply from zeck (ZKS-450SX) because they make little noise (large 12cm fan). I installed this PSU correctly. When I push on the on-off button of the power supply, all my fans abegin to turn and my special card of MSI (with 4 leds) says 4x red = install CPU. When I then push on the power button of the case, the PC starts normally. After a shutdown all is normal. But .... when using the PC, it locks-up after a while (sometimes 1/2 hour, sometimes 3 hours) and I'm just surfing on the net. After this lock-up (push 5secs on powerbutton of the case) , the PC gives same problem...

When I install my original PSU, everything is normal.

Any idea what could be wrong with the power supply, what to check for ? Or send it back to shop.....

Check your heat build up. How hot is the Case getting, the CPU etc. At low noise fan is a slow fan, which may not exhaust all the heat that system is producing. What was the wattage of your old PSU?

CPU 32°C
CASE 34°C
HDD 34°C

old PSU was 300 Watts

When the PC starts (after pushing case button), I also see that after the first 3 secs the fans get a dip. After this, the fans act normally.

Not heat. Those temps are normal...OK do you have a voltmeter? When you say your fans dip, that means you notice a speed difference for a second or two? This not normal for Powersupplies. Your fans should stay constant. A dip in fan speed implies a voltage change. You may have bad voltage regulation on the new PSU which could cause your system to shutdown at random.

Nop, no Voltmeter at home. I have tested a new MB (changed from MSI-K8N Neo2 Series to a MSI-K8TNEO2-FIR). Now the start-problems are over. Fans are stabel. But I have in a new installed XP with big cpu-load that the PC blocks for a few seconds (temp rises to 64°C !! with 100% CPU).

When I read other Forums, PSU is often the problem for such errors. I wil ltry to read Voltages of the PSU, place my original PSU and see also for the Voltages. I will enter results here tomorrow ...

Sorry it took this long, but I had to do quit a lot of tests ...

I found out that the MB was not stable and had to change it back to the store. What bad luck will happen to me next time ..
Because the problems stay the same, I bought myself a new MB + CPU + VideoCard (PCIE). I think this thread may be closed, but I don't know how to do this ...

Thank you for posting back you fix.

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