Many brand name systems work just fine with a 250 watt
supply. 400 watts is well beyond what most everyone needs.
But then too many buy 'dumped' import supplies - making a
decision based only on price. The supply that is labeled 400
watts may only be 300 watts or less. So many computer
assemblers simply buy larger supplies rather than learn why
failures happen.
Discovering a power supply problem is quick and easy. Takes
but minutes and does not remove or change anything. No reason
to replace a supply unless it first is obviously a problem.
Procedure will probably take longer to read than it takes to
determine if power supply is really undersized:
"Computer doesnt start at all" in alt.comp.hardware on 10
Jan 2004 at
http://tinyurl.com/2t69q or
"I think my power supply is dead" in alt.comp.hardware on 5
Feb 2004 at
http://www.tinyurl.com/2musa
In the meantime, what did system (event) logs report?
You symptoms can be created by a power supply controller
that is located on motherboard. Replacing the power supply
would not solve this problem. However heat is an excellent
diagnostic tool. Selectively heat motherboard sections and
other computer components with a hairdryer on high. That is a
normal operating temperature for all computer parts. A
properly working computer must work just fine in a room at
over 100 degree F. But intermittent components tend to fail
when heated. Heat is another diagnostic tool to locate a
defective part without wildly replacing anything.
Again, 400+ watt power supplies are well above what a
typical computer system requires. If power supply is too
small, that above procedure will identify the problem
immediately. And the event log says ...?
newtechie wrote:
> Thanks so much for your reply. I'm unsure why the fan is not coming
> on if overheating is the cause. The fan on the CPU sounds and looks
> normal. I might just have to buy another power supply.