Power supply question please

[spooky617]

I am wondering what could cause this problem, i have a 400W Deer power supply that came with my Chieftek case, i have swapped a fan inside the power supply ( one of the Antec color led fans ), and at the same time I have installed Soyo KT400 Ultra motherboard & Athlon XP 1900 processor with 512MB of PC3200 Samsung memory. Three days later I went to use my computer ( it has been running all this time ) & i noticed it was off, I tried to turn it on but it would not power on until I unplugged the power cord from the power supply & plugged it back in, then the PC came on, it has been on for last two days. Now, when the WinXP booted up I did not get any errors that it was shot down improperly or anything like that.
Someone told me that it could have been the power supply, it turned itself off & some type of switch was triggered in there or something like that. Could this be the fan I have in there? What RPMS should be the fan running at inside the power supply?

Hope someone can help.
Thanx

P.S. My system is not overclocked or anything like that.

 

[hmsrolst]

You might get some much more specific analysis than this, but Deer PSU's have a bad reputation.

 

[spooky617]

That would explain why it came with the case & did not cost me any more money.
Time to swapp the power supply most likely
Thanx

 

[warnerwh]

Read where a couple of people who build computers have seen Deer supplies wipe out the whole system and frequently see them come in due to failure. Get yourself a Sparkle/Fortron, Antec,TTGI or another known brand that holds up well and makes spec. It may be much cheaper in the long run.