Acer Aspire T350-orange coloured lighting up of the power LED directly after pressing t. pwr button

RRK7

Acer Aspire T350-orange coloured lighting up of the power LED directly after pressing the power button

a successful boot procedure of this desktop PC so far:

Plug in the power plug
Power button 
Fan rotates processor and case (sounds like full-on: about 4 seconds)
and boot!

but now:

Plug in the power plug
Power button
immediately orange colour LED lights up on the case front panel
...and nothing happens

I knew the orange colour LED until now
for the OS that has been started and can be switched to standby mode if required in Microsoft Windows or Linux.

I promise you this is the first time this has happened.
Any suggestion, hint or tip from you?

Jack22

@RRK7
Unplug all the wires goes to the tower including the power cable than press and hold the power button on the tower for 30 seconds and than try to turn back on. You can also try to remove the Ram and put it back on but try that with the help of some local tech and check

Jack22

@RRK7
Unplug all the wires goes to the tower including the power cable than press and hold the power button on the tower for 30 seconds and than try to turn back on. You can also try to remove the Ram and put it back on but try that with the help of some local tech and check