HP Z600 PSU Troubleshooting

[Mod_Builder]

I have HP Z600 PSU which has gone bad. When I connect the power cable nothing happens even the greenlight doesnt appear. I opened the PSU and visually inspected, it appears no component is covered with soot so a good sign that component might not be blown due to current. Could this be due to blown fuse as the fuse is wrapped inside heat shrink. Should I cut the heat shrink open to inspect as this could be most likely the culprit?

[DGroves]

the fact that you are asking these questions provides the answer that you should not be poking around in this part as you lack the required skills, it's no hoax that there are things in that supply (even disconnected) that can/will give you a nasty surprise if you touch the wrong places

there are some things that unskilled persons should not play with and in my opinion this is one of them either locate a qualified repair person/shop or buy a replacement supply

[Mod_Builder]

I did a bit of research and but couldnt find the information that will the green light automatically turns on if we merely connect power supply cable to the unit or it turns on when the PSU is installed in the PC and the start signal is received by PSU. The green light is the diagnosis tool so this information will help me a lot.

[Mod_Builder]

I have de-charged the big capacitors so the supply is safe to work with. Also discarding this shall be waste of amazing piece of hardware with potentially majority of components still operational. The caps still seem to be in good condition as there is no electrolyte leaks and the chips still visually seem to be fine as there is no sign of burned stuff. 

I shall rephrase my question. If we put the power supply cord to PSU, should the green light on the PSU turn on or it will only turn on when the start signal is given by pressing the power button on the PC? 

[DGroves · Accepted solution]

the "BST" (builtin self test) is covered in the z620/820 service manual which is available for download on the HP site

[Mod_Builder]

Allright, I have accepted this as a solution. Thanks,