Logon screen / wake up problems have come back

Hi, I've got a first generation macbook.
Originally, I had a lot of problems when waking up my macbook.
1) I'd use it
2) I'd close the lid for some time (hours) which sends it to sleep
3) I'd open the lid and either nothing would happen, or I'd enter my login credentials then the screen would just go blank.
4) The only cure would be to close the lid again for 20 or 30 seconds then repeat steps 3) and 4) until I logged in and the macbook was usable again. Sometimes I even had to hold down the power button to force a reset.
These problems disapeared but now they've come back.
Does anyone have any ideas please? (and re-installing the OS doesn't count)
Thanks,
Tom

What do you have against reinstalling the OS?
You can Archive and Install without losing any data whatsoever. I see that you have only updated to 10.4.8 unless maybe you have just not updated that info in you Apple Discussions info.
This may not be for everybody but what I do with every computer I own is two things:
1) I have an external backup hard drive that I make a periodic clone of the computer's hard drive.
2) I partition my computer's hard drive into more than one drive and use one of them as a clone of the main drive.
This way I always have the ability to do an update of any kind to my drive but without taking any risk of messing up it's pre-update state of affairs. I can always clone it back to where it was using one of its clones.
The idea is to put yourself in a position such that you cannot get screwed by doing a re-install or an update, or experimenting with risky software or ideas for fixing problems by deleting certain programs or any number of other things of this nature. Having only one copy of your computer's hard drive is a very risky way to operate, but it seems to be the norm by a large margin.

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Logon screen / wake up problems have come back

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