My MBP shuts down or sleeps (?) when I close the lid

Hi
Forgive me if this is a stupid question, but I haven't been able to solve it on my own by investigating, asking others og reading this forum.
My MBP from late 2007 has recently started to shut down/sleep (or maybe even "hibernate" - not sure which is the right term) when I close the lid - meaning that when I open it, it *doesn't wake up automatically* like it used to. *I need to push the "on" button and it takes it a while to start up*. It doesn't start up from scratch; it shows the last screen shaded in a light grey tone - and it's takes quite a few seconds to get ready. As far as I recall, it "woke up" automatically before.
I haven't changed my preferences - and they are all set to "never", as my MBP is nerly always connected to the adaptor.
Any clues to what happened and how I can change it? It's really annoying!
Thanks,
Carina

Welcome!
When my MBP started that same behavior, I found that I had accumulated a huge list of wireless networks on my travels. Reviewing the system log, I found my computer was trying to connect to one, a hotel network to which I had connected weeks before and miles away.
Here's how I fixed it (I have 10.5.8, not 10.6, but the fix should be the same):
1) Open System Preferences and select "Network."
2) Be sure "Airport" is selected in the left side of that preference pane.
3) Click the "Advanced" button. If the next screen does not have the "Airport" tab selected, select it. There should be a window with a list of networks.
4) Use the + and - buttons below to remove any networks you have accumulated that are not needed. Example: on mine, I removed all but two networks--our home network and the one at a local museum where I volunteer.
5) Once you'd cleaned off the list to the bare necessities, uncheck the option labeled, "Remember any network this computer has joined." This will not prevent you from using other networks on later travels but will prevent them building up and creating problems.
That completely cured my wake-from-sleep problems. and other have said it worked for them, too.

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Test after each of the following steps that you haven’t already tried:
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 ▹ System Preferences ▹ Print & Scan ▹ Open Print Queue...
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My MBP shuts down or sleeps (?) when I close the lid

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