-upon power up PC boots and works ok for few minutes if you disconnected the HDD( I guess until something heats up inside the supply) and if you connect hdd and external usb pen drive then upon power up , no graphics to monitor at all although PC seems to boot again
-tested motherboard with another supply and replaced the big 16v capacitors in power supply but still the same,what else(component) could be wrong with it?
If it works with another supply, why waste time with the bad one?
Heat-related failures can be bad solder joints, which are sensitive to a sharp rap with a stick, or just about ANY semiconductor component (one usually applies freeze-mist spot cooling and sees where it makes a difference).
More important, power supplies have overcurrent protections, like a fuse, built in. When it goes into 'protect' mode, the power supply shuts down, BUT THAT ISN'T THE FAULT. The fault is whatever is drawing too much current. A different power supply, with a different limit, might not shut down, but that doesn't mean the fault has been found; something might still be drawing too much current.
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