Power adapter light goes out & battery kicks in + random shutdowns

Hi,
there's a few weird things going on the last couple of weeks.....i'm wondering if any of them could have to do with the 10.4.9 update that i installed and really screwed up my mac.....it took an hour+ on apple tech support to do the re install because it would not load after i did that update.
so here's the screwy things that have been happening:
sometimes the light on the power adapter just goes off and the battery kicks in - i'm wondering why it does that........and sometimes the power light goes off the computer just shuts down at the same time really fast.......like in less than a second.....i'll wait a little bit and start up again and it'll happen again........but sometimes it'll fine for quite a while and then boom.......it shuts down again.
also, sometimes it's sleeping and when i pop the top the light on the adapter cord goes out.
also, the sleep light is not on when i am using it but goes on when i put it to sleep
i contacted apple (no apple care and past the 90 phone support) and they are sending a new power adapter cord.....the guy at tech didn't know if this was a hard drive issue (which means i could send it back and get it fixed for free cuz of warranty) so we're trying a new cord first and see what happens.
has this happened to anyone? my mac pro is about 5 months old....
thanks,
itsmesunny

Hi,
actually the cord came today........and the other part - the square white thing with the cord connection to the mac with the magnet...... is coming separately - i found out after calling them and asking them where the rest of it was (he said maybe it was from a different warehouse was why they weren't together).......is that the "magsafe" that you're referring to?
when that comes i hope that when i hook it up it fixes the problem......i'm using my oldie but goodie ibook now until it's working ok....
the guy did not ask me to reset the smc.........i guess cuz i don't have apple care or tech support now that's all he was willing to do - send me a free power adapter and see if that works first - he said it was $49 to do anything else but if it was determined to be a hard drive issue then it would be free and refunded to me and i could send it back.
you know i think it depends on who you talk to......sometimes they help me even if i don't have the tech support.
so anyway when i get the adapter i'll hook it up and see if it's a go...
thanks,
itsmesunny
PS apple is quick - both times i've sent stuff to them i have gotten it back almost immediately. i talked to the guy yesterday and it was here today....can't beat that!

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