TSGL: Something seriously wrong with my PC

[Bo Maurin]

Hi all,
I have a four year old PC which is quite up to date as I have upgraded
HW as years went by.
Last week I realized that I could not turn it on. At the back of the PC,
there is a diode light which is supposed to have a green solid light.
That light is now blinking and there is a small tick-tick sound from the
PSU. When I press the "On" button nothing happens. Not even the fans
starts spinning.

I followed an advice a got from a friend to detach the PSU-MB (24 pin)
cable in the PC, connect the PSU to a power outlet and then re attach
the PSU-MB cable. The computer then booted normally. But when I shut it
down, leaving the PSU-MB cable in place and try again, the computer is
once more dead.

I except that the PSU will need to be replaced, but is there anyway I
can confirm that the PSU is the issue? The PC is from Compaq which means
I can not use just any ATX compatible PSU.

Regards / Bo