Randomly Shuts Off Then Screen Stays Black...?? Very New At This...

So this is my first Mac ever, I bought it from someone off of Craig's List about 4 or 5 months ago. It's a 17-inch PowerBook G4 ... I really don't know much specs about it, I'm not too computer savvy when it comes to specs and rams and ghz and all that - I don't even know what any of that means.
I think I'm running Tiger 10.4.11 .. Or at least that's what someone told me.
Anyways, it's been working amazing until recently - never had a problem with it until now. Whenever I would close my laptop, it normally would go into sleep mode, but within the past week, I noticed that it would turn on while the laptop is closed... I could hear it turning on, and then the Apple on the outside was lit up. The only way I could stop this from happening was to completely shut down the laptop before closing it.
THEN... while I'm using the laptop, it would blink black and then back to normal and then randomly shut down. I would have to press the power button for it to come back on. It would do that several times in a row...
THEN... it started to go black like that, but then when I would try to turn it back on, I could hear it booting up, and it would sound like it's on, but then the screen would remain black.
I could very very faintly see the outline of stuff on the screen, but it would only stay like that for a few seconds then fade to completely blackness. I would have to continually press the power button, sometimes having to restart it several times before the screen actually comes on.
Today, is when it did it for the longest - the screen went out this morning, and I couldn't get it to come back on until maybe 30 mins ago. And that's cuz I got kinda frustrated and slapped the sides on each side of the mouse pad and then the screen flicked back on as if I hit the computer just right for it to turn on.
Sooo I don't know what to do... it's gotten progressively worse with this problem. Being a second hand Mac, I don't think it's under any kind of warranty to take it into the Apple store to get looked at... and therefore, I don't know how much it would cost to get it fixed. If it's even something serious or minor.
I don't have much money to spare because I'm in college currently and barely make the money to pay my tuition.
Oh yea, it also doesn't matter if I'm using it just on the battery, or if it's plugged in. It does it no matter what.
Any suggestions??
Please help...
And keep in mind I don't know a lot of technical terms...
Thanks in advance!
Rev. JC

Rev_JC:
Welcome to Apple Discussions.
There are a number of possible approaches to your issue. At first I thought it may be that your logic board was going out. The it sounded as if you needed to Reset the PMU. Finally, who talked about slapping it around and getting results, it sounds like it may be a loose display cable or something of that sort. Since you are completely new to Macs your best bet would be to go online and make an appointment at the Genius Bar in your local Apple Store. It costs nothing. They will look over your computer and give you an idea of what is wrong and what it will cost to rectify it.
Meanwhile, to help to identify your computer more closely, while the computer is booted go to Apple Menu > About this Mac. That will tell you the OS you have installed, the Processor speed and the computer you have. Please report this info back with you response.
Please do post back with further questions or comments.
cornelius

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This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
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The steps detailed below can help stabilize your iPhone.
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
After at least 30 minutes, if:
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The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
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If the display turns on, go to step 4.
If the display remains black, go to next step.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
My issue is still not resolved. What do I do next?
Contact Apple Support.
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Cheers,
Allen

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Message was edited by: Dibenkorn

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Regards,
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Hello everyone,
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1. Shut down you computer.
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3. Boot in safe mode
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So let's say it's damaged, would that be the symptoms of my computer?
And if it's the processor, the only way to fix it is to send it to a reparator or something, because I don't feel like it, I'd rather do it myself.
But right now, my computer is simply not booting, like I said in my previous post.
Thanks in advance,
MrRoy
Note : The edit button wasn't there so I had to double post :/

Macbook Pro 2007 Random shuts off

I start having issues with my Macbook pro it's randomly shuts off, sometimes in 5 minutes, 30 minutes , 3 hours or even before it will boot to the os.
It's getting really hot and fast without doing anything, any help??

My macbook started with the monitor going black but the light was still on. Now it will randomly shuts off and a light blue screen pops up saying my computer shut down due to a problem. Then reboots. This happens sometimes 5 times a day, sometimes none. I thought it had something to do with using video because it tended to happen when i was watching video. Now I just move my computer on my lap and there it went.
I took it to the genius bar - they ran tests, etc. and found nothing (after 5 days). The guy was extremely rude and not helpful at all. After my IT guy and myself went to the Apple store, they gave us a hard time saying they couldn't replicate the error. So after a few seconds, the man changed his mind and said he was going to change my logic board.
$600 later (luckily still under warranty) - my computer shut down again tonight.
Not a clue what the problem is. I had 90% battery life. I have noticed that recently I've been putting my copmuter to sleep before I close it.
Anyway that could be it?

Randomly Shuts Off Then Screen Stays Black...?? Very New At This...

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