O.O! This will probably be either non-helpful, or way too late for your old laptop. If the computer keeps powering down or is like a dead fish, no power at all, the likely problem is either the adapter, powercable, or the internal battery.
The lap's probably powering down to conserve energy because the battery isn't recharging via the adapter when its plugged into the power.
If it'll boot up and you can login like normal to the operating system it probably isn't an internal error to do with the central program, i.e. the Operating System. If you get a 'blue screen of death' then the OS is likely to blame with malfunctions either in the motherboard, or the Hard Drive.
However if it boots up etc, and you can do some stuff normally before it stuffs out, then it will be the powersupply, power cable, or the battery.
You could probably recover data from the hard drive if you wanted too, by hooking it up to another laptop motherboard and booting it up. It's best to do this only if you know what you're doing though. I.T technicians can be expensive too.
Or if you took backups either on an external drive, i.e flash (USB drive) or an external hard drive too that would work. USB based external drives can just be plugged into another PC and data accessed. Beware of viruses though, and if possible do a virus-scan on the USB drive before you access any data on it. Standard rule of thumb when using external drives, it'll protect your PC.
~ Pyre
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