Mickey: no POST? no signal on display.

Hello everyone,

Pc worked in the afternoon, then later it won't boot anymore. Reasons could be:
- turned off PSU switch while pc was still running
- brother has accidentally lightly hit the pc case

When turning on, no signal appears on the display, all fans rotate, mobo led's shine as they usually do and no beeping whatsoever.

First, I unplugged power cord, switched off PSU and pressed power button to free any left over electricity -> no signal.

Then, I removed CMOS battery for...

no POST? no signal on display.

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