MacBook Power Cable Flashes Red! Computer Dies!

Hi, i have a macbook and the laptop battery broke a few months a go and now it only works whilst using a power cable. But over the past 2 weeks i have found that the light on the power cable sometimes flashes red and then the laptop dies, do you think this is a problem with the cable? and getting a new one would fix it? or is it a problem with the laptop its self.
Help

Hi LexSchellings,
Thank you for your quick response.
My 15" MacBook Pro was bought in March 2010 and has recently been upgraded to Lion OS. The MBPro has been playing up for a while, so I have also had the hard drive and the motherboard replaced. In fact, I picked it up from Apple less than a week ago with the replaced motherboard. The reason for replacing the motherboard was because the MBPro was crashing all the time.
It was running fine all week including last night, but when I tried to switch it on this morning it was dead. Since the powercable that came with the MBPro did not show a light at all when connected, I tried an older powercable and this is when I noticed that the amber light was flashing.
I'm taking it in to a Geniuys bar tomorrow, so hopefully they should be able to sort it out.
Again, many thanks for your response.
Trond

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