At the moment, I can't run my iBook with the power adaptor. When I try to use the computer, the power adaptor cuts out and there's no light, no charge - nothing. It will charge the battery when it's in sleep mode but as soon as I open the screen, it'll cut out and I have to shut down the computer and wait 30 minutes before the halo light comes back on and it starts charging. I'm hoping it's just a problem with the adaptor and a new one will fix it but I'm worried it might be a problem with the computer. Over summer, I used it in very hot weather and I'm wondering if that might have damaged it. Help please!