When my screen goes to sleep and then the hard drive goes to sleep why won't the screen wake up?

I can repeat this 100% of the time. If I let the screen go to sleep (or I manually put it to sleep) and I shut the computer so the hard drive goes to sleep (or if the hard drive simply goes to sleep on the timer), when I open the Macbook Pro the screen will not wake up, although I think the hard drive does as the back light on the keyboard turns on. Any ideas on why this is happening. My computer is 4 weeks old...a bit frustrating. The best answer I have gotten is get a new one for Apple...or completely re-install the OS.
Jared

The reason why it's happening is not obvious and can't be determined without more information. The fact that you can reproduce the problem makes it a lot more tractable.
As a first step, boot in safe mode (shift key down at startup.) Can you reproduce the problem now? If so, note the time, then reboot as usual (not in safe mode) and look in the system log for error messages at the time the screen failed to wake up.

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Whats the problem? how can I fix it?

komivi wrote:
my 2007 20inch Imac keeps freezing/crashing and the mouse is moving while its frozen?
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How to prevent the hard drive to go sleeping ?

My 20" core 2 duo imac is now running 10.4.8, on the standard 250Gb hd (from seagate : model ST3250824AS).
I remarked that after a few minutes of idling, it goes to sleep (I can easily hear it spinning down... and up when I need it or by itself a few moments later, with the spinning ball for a few seconds...)
I find this behaviour a bit stupid on a desktop computer and I would like to prevent it... I found something on the energy panel (preferences) and I unchecked the case allowing the harddrive to go to sleep as soon as possible.
No change.
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phjo

This presumes that the hard drive itself doesn't have
a built-in sleep control that's independent and
unchangeable. However, even drives that do usually
have a sleep time of at least 15 minutes. That
doesn't sound like the case for your drive from what
you've posted.
It might well be that, in the sense that I'm not that sure that the delay after which the drive goes to sleep is less than 15 minutes. (Not everything done on the computer involves disk access, so when the hard drive went to sleep, it might have been idling for longer than what I thought.)
That being said, on seagate web site, the documentation about this model states that power management should be accessible through the operating system setup, so it looks like nothing is unchangeable...
Maybe power management in tiger does not comply completely with this drive specific controls... yet... Quoting the documentation : <<the standby timer delay is established using a Standby or Idle command.>>
but it appears that when the drive enters Idle status, for the internal seagate hard drive as well as the external firewall (when plugged in) the delay that is applied is 1 minute...
phjo

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When do the hard drives go to sleep?

I have the default power saver settings on my Mac Mini with Yosemite. One of the options is “Put hard disks to sleep when possible” which I currently have checked. The trouble I have been trying to get through a ClamXav virus scan on my machine since yesterday and it seems that overnight (and possibly when I went out for a few hours) it stopped working, only to start up again when I woke my machine.
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When my screen goes to sleep and then the hard drive goes to sleep why won't the screen wake up?

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