My system fails to turn on

Hi guys,
It would be great if you would help with my problem.
There was a problem in my system that whenever i try to restart my system it dint turn on again and have to wait for 5 mins before i was able to start.I dint care much as i would turn off the system instead of restarting.

But for the last couple of weeks my system is experiencing problem even when i turn it off and turn again.It takes atleats 15 mins before my system boots up and works.

Whenever i try that on before 15 mins it would show a screen with my motherboard name simmtronics and then turn off.my whole cpu starts when i turn on but it loses the power there after.I am not even able to enter setup screen


This is my system configuration
Os-Windows & and Ubuntu 10.04(both 32 bit)
Motherboard-Simmtronic G-31E(J)
Processor-Intel core2duo E8400 @3.00ghz
Ram-4.00 gb but shows oly 2.99gb(usable).

I changed my motherboard to simmtronics six months before because the intel motherboard was causing the problem of not at all turning on when i shut down.
 
Have considered the probability that it may also be an PSU issue? By the way what is the make/model etc. of it, how old it is ?
 
I would like to know what make and model you are referring to.

Ram,hdd,processor-2.5 years
monitor,motherboard-6 months
 
I'm talking about Power Supply Unit (PSU). Have you checked your system with different PSU ?
 
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