Power shutoff within a few minutes even in BIOS using ACThe HP Pavilion ze4420US laptop formerly had a problem turning it on, where you had to press the power switch many many times...
Answer to: Power shutoff within a few minutes even in BIOS using ACAnswering myself here. Took it to a local repair person, who ran a memory test from a bootable CD that revealed a RAM failure. Replaced memory stick, all is well. The BIOS mem test did *not* detect this problem. Thanks all!