My daughter owns a Toshiba Satellite Pro 6300. The internal clock resets as do other things when she unplugs the AC adapter and shuts it down. I assume this means a new battery is needed, the little one that keeps the "bios" running correctly. She had the motherboard replaced with a good one about 4-5 years ago, so it is probably not the motherboard issue.
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The AC Adapter has to be used which is compatible with the particular model of the Notebook. You can refer the User Manual came with the Notebook to know the exact model number of the AC Adapter. To confirm whether the AC Adapter is working or not you can check the LED light of the AC Adapter, if the LED is glowing then it is working fine.
The function of the AC Adapter is to charge the Battery of the Notebook.
You can also use the Notebook by connecting the AC Adapter while it is charging or when it is fully charged.
There's a couple of things you can try here. First I would connect the laptop to an external monitor. If that works, then check to make sure that it is set to internal screen usage by pressing the function key and holding it while pressing the f5 key. If this works then problem solved. However if you get an external screen but the laptop screen still does not turn on then the problem is internal to the laptop you need to get a tech to look at it.
Next, if the above procedure does not produce any results, take off the battery, take off the memory, press the power key a couple of times, replace the ram and the plug in the ac adapter and see if it works. Replace the battery and see if it works. If it works without the battery and not with it then your problem is your battery.
Since you are getting the battery and power lights to turn on, I doubt that it would be your dc jack.
Replace the AC Adapter, (ebay from £10.00). Did it come with XP on it? Mine came with Vista and there are conflicts with XP and graphic adapters. There is no XP driver for the ATI adapter in mine. Go online to Toshiba and download all of the updated drivers that you require. A user friendly system.
unplug the laptop from your ac adapter. remove battery. plug in your ac adapter - now the power LED should show a green. now if you turn it on, and the power LED blinks orange (amber) - you have a bad motherboard.
these are older units (the 4300's are 600mhz, 650mhz, and 700mhz for 12", 14", AND 15" screens, respectively). Your best bet is to buy something comparable on eBay, and do the swap yourself. These systems (and motherboards) have been spectacularly reliable, and used, incomplete systems are practically being given away on eBay for a pittance... That's how I'd approach it.
Try the following. 1. Remove battery and plug in the AC Adapter and
check if it works If yes - Battery is defective If no - Motherboard Problem/AC adapter
2. Check the AC adapter LED indicator if its
lighted or not(double check by a multitester) If lighted - it works
properly if not - replace 3. Try to reinstall WINDOWS operating
system by the use of the installer CD 4. Reformat your computer and install necessary drivers and applications
You should NEVER see sparks when connecting the AC adapter.
If you are seeing that there is damage in either the adapter, the AC plug or both although I would suspect internal damage in the plug.
Unless your handy with a sauldering iron I think this would be a good point to take it to a pro, they can test the AC adapter with a voltmeter and confirm or deny my suspicion. If I'm wrong the voltmeter will show wrong voltage for the unit, if I'm right it will be in tolerance and you'll know the AC plug is the most likely culprit.
Depending on the model and the repair shop these typically cost about $100-$200 to repair.
One computer I fixed had its internal power regulation confused. With the AC adapter plugged in, holding the power switch down for twelve seconds, then pressing it again, switched it back on. This sort of problem can come from a variety of causes, though. There is an internal power distribution chip which could have received a static electric shock or power surge and gotten cooked. The RAM could have gone bad. The socket where the adapter plugs into the computer could have been cracked loose. Check the power switch and then RAM first, and write more if that doesn't fix it.