I am trying to revive a Compaq Presario SR 1780 AN PC.
Everything was ok some weeks ago. I used it for several hours and had normal shut down late at night. Next morning I pressed start button, front led came on also all fans and hard drive but no beep and no POST just spinning discs and fans. Have tried new PSU, new MOBO plus tried with everything removed except PSU, MOBO and CPU. Still no beep or POST. Have not tried new CPU but even with CPU removed there should be beep and POST, I think.