Macbook pro 15" and 17" display turns off whilst working then.......

I have 2 macbook pros. One 17" and the other 15" both are the non unibody ones. The 15" had this problem a while ago but my 17" never did it until today and then it did about 5 mins ago.
Whilst I am working (never seems to happen when I am not using it) the display turns off whilst working. The power light remains constant (ie:- not fading in and out when asleep). But here is the strangest thing. The mac repetitively makes the same noise as if it was ejecting a disk. Has anybody else had this? Know a cure? I recently upgraded to snow leopard but don't think this is a software issue.

I got the same problem with mine, 15". I bought it refurbished from apple store. I had this problem when i bought it then nothing happened for 4 months. But now my MBP has started doing it again. And i don't think it's a software issue. My display switch on after few sec, or 1-2 mins it's depends, and it's pretty random. i'm a bit of worry

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That seems like a loose or failing cable.
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Genius reservation http://www.apple.com/retail/geniusbar/
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I thought it was intermittent to begin with until i started looking into it. By leaving programs open, like aperture, before i put the machine to sleep it appears to wake the external monitor up without a problem. If i shut all programs or leave basic things open like safari and mail which don't require the dedicated graphics, then upon wake it wont register an external screen is connected.
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Hi all, I finally took my macbook into the apple store and met with a genius. I am really not satisfied at all and I will explain why.
My macbook was working fine until the battery died, it was powered on and functioning etc. and it was just my cord that had the issue (until the battery drained completely). I have seen a lot of posts about macbooks just not turning on until the battery that has died is charged and inserted.
The day of the appointment I took another look at my macbook after leaving it idle for a few days. At this point, the battery has actually expanded and broke out of it's original case. This happened while the battery was drained and the macbook was off and unplugged. From what I have read, this happens all the time with these batteries and there was a program put in place to replace them at one point?
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Also, he made it seem like I needed to pay for the top case first before they would spend any time even looking at my macbook to see what is wrong.. is this correct? You need to purchase a part or they won't open your computer?
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Currently using a late 2013 15" Macbook Pro., latest version of Mavericks. I have one display hooked up through Thunderbolt->DVI, with a second set up through HDMI->DVI.
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f I may waste a tad more of your time, is the reason behind the GPU and quad core because of photoshop or the 27" monitor in general? The only reason I ask is that I am only a casual photoshop user so that alone may not sway me, but if powering the thunderbolt display is of a concern for the lesser device then the decision becomes much easier.
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Macbook pro 15" and 17" display turns off whilst working then.......

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