I'm rebuilding a vintage PC (Pentium 133) and when I power on the computer, power supply fan, HDDs starts but not the CPU fan. The screen also stays black (orange light). After like 15-30 secs, the CPU fan start to spin and you can hear the starting "beep" and the memory test finally show up on the screen.
It's strange that (most of) everything start up right away on the motherboard except the CPU... Fist time I see this. If I ctrl+alt+del, it does the same thing the PC "freeze" for like 20 secs before showing any text on the screen (BIOS/Post).
The power supply is new (it's a Corsair cx400w). I have tested 5 different memory sticks and I get the same results every time. I tested 2 CPUs, same thing. Tested up with no PCI / ISA / IDE with no success. I aslo just changed the CMOS battery with a new one.
Anyone have an idea why I have this behavior? What can cause this?