Satellite A300D-15B - Switched off and charging issue

Hi
I have a Satellite A300D-15B, running Windows 7 32bit, which bought quite recently used. I have encountered a couple of problems which I hope someone can help me with!
Firstly, the day I got the machine, it switched suddenly, but turned back on immediately and seemed to be ok. Afterwards, 3 weeks later (saturday 2nd July) I was installing some software when I got a virus warning from AGV, within a few moments the machine again turned off suddenly. Unfortuanetly this time it would not turn back on and the charge/AC supply lights would not come on. After doing some research I found that disconnecting the BIOS battery and dissipating the power enabled me to turn the machine on. Is there any known issues which could be causing this?
Secondly, once I had got the laptop to turn on after the sudden shutdown on staurday, I have found the charger still wont register as being plugged in unless i use the folling procedure.
1) diconnect the mains fuse cable from the transformer block
2) remove the battery
3) plug in the DC jack
4) reconnect the mains cable to the transformer which causes the mains light on the laptop to turn on.
5) reconnect the battery
The laptop then charges normally, I am using it to write this post.
I have to use this process everytime the machine is unplugged from the the mains or charger, which is irritating and also a worry that there could be big problems on the horizon.
Any help would be hugely appreciated.
cheers
John

Hi
I upgraded it to 7, the first time it shut down was the first time it was switched on after the recovery disc had been used. Could that be an out of date driver on original settings? Then upgrading to 7 giving similar problems?
I upgraded to 7 not a fresh install, which I never usually do.
The charger is a genuine unit not a 3rd party, I won't use them as I've had issues in the past. I'm just concerned it's a mainboard problem given the shutdown and subsequent strange charging behaviour. Do these have EEPROM's in the chargers and maybe clearing the CMOS has caused a recognition problem?
Cheers
J

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Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIs and corrosion.
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Satellite A300D-15B - Switched off and charging issue

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