It could be almost anything, but if you want to eliminate problems with the new power supply, you'll probably need to do the "paper clip" test (if you haven't already).
It's not simple to test a PSU off-board without certain steps. A number of them may well require at least a small load before showing any life. (I've been there, got the T-shirt).
Various links on the web will detail the method - this is a reasonable one:
www.evercase.co.uk/PDFFilesandForms/HowToTestAnATXPSU.pdf
Note the advice to leave a load attached to the psu (on one of the other cables), a case fan should be fine.
(of course, you may already have done this).
Edited to add:
You have switched the new PSU on? ;-)
Last edited by: tyrednemotional on Tue 12 Jan 21 at 17:02
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