I was wondering if anyone can help me. My laptop will not turn on unless my AC power supply is plug in and turned on. Then my laptop will turn on. Without it I can't turn it on with just my battery.
I have checked that the battery is fully charged and works, as when I turn my laptop on and then take the AC power supply out it runs fine with the battery.
It just I can't turn on my laptop without the power supply. Its really ignoring.
This has happen before, but it normally just returns back to normal, or before I had to reinstall windows anyway, and once I had done that it was back to normal. But I try that this time and it hasn't work.
I really appricate it if anyone can help me.
Oi. You never mention what type of laptop you have, its model number or age, so everything following is pure supposition. 🙂
I called a buddy of mine who used to be a spec engineer in PC division and together we came up with a laundry list of potential problems.
** NiMH battery memory problem; Some of the older batteries have 'battery memory' -- much akin to Pavlov's dog experiments. A battery with little or no actual charge, but a memory level set at full drainage near 100% would show in any form of APM or ACPI a full charge, while not containing enough power to charge your toothbrush.
** CMOS battery problem; CMOS plays a larger role with laptops, what with ACPI and APM. Once bypassed in certain laptops, problems disappear, as in the case of plugging in AC for boot.
** Laptop has a secondary battery which is dead; some manufacturers enclose a third (main power, CMOS are first two), power assist battery. Hitachi is one that comes to mind.
** APM/ACPI issue; Something is wildly wrong with the code itself or the kernel implementation.
** Mainboard register malfunction; some of these I hate to even mention -- this is one of them. 🙂
I doubt it's a short, as it would manifest itself in many other ways, not the least of which through the installation of AC power. Normally laptop batteries are either bypassed, then charged through a different circuit or charged in conjunction with the introduction of AC power.
How long the laptop lasts after AC power is removed would have been a good question to ask...so I think I will. 🙂 If you have only left it on long enough for simple testing, then I go with answer 1 as "best guess". Without additional information, I think it would be nigh impossible to come to a resolution.