IMac - Display doesn´t work after restart

My iMac 21 Display doesn´t work after restart. If I turn it off and 1 hour later I want use it again the iMac shows the white screen with the mac logo and then the display goes off. I connected an external display to check if the iMac was ON and with the external display I can login and do everything but the iMac Display doesn´t work .
If I turn it off and wait 3 or 4 hours and then turn it back on the display works OK.
This is very strange behavior I have spent hours and hours trying to fine the solution or a similar issue but nothing so I am looking help here at apple.com
BTW When I bougth the iMac 21 there were some spots over the display so the display was replaced by the provider. The warranty has expired by now.

To tell you the truth, I don't know if they have to repalce the LCD panel or what they do for a bad backlight. In this reality of block or assembly replacement it probably involves repalcing the panel and not the backlight component. Don't know what it would cost. You'd have to ask that of a service center.

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OS X: When your Mac doesn't sleep or wake - Apple Support
http://support.apple.com/en-us/TS5357
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MODULES=()
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interface=eth0
address=
netmask=
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gateway=
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Restarting eth0 through wicd-cli still did not work. I also tried resuscitating the network via instructions on the configure network page before trying to focus solely on wicd.
I found a few similar problems on the forums by searching "wicd hibernate" and tried several solutions but they did not work. Several problems seem to be that the network doesn't work after a suspend because I guess the stuff in RAM did not get saved? But people were able to restart the network by running "/usr/lib/wicd/autoconnect.py" and I wasn't able to get this to work. As a final effort, I added "resume" into mkinitcpio.conf and placed the machine into sleep again to see if it may magically reset something but of course this did not happen .
mkinitcpio.conf:
# vim:set ft=sh
# MODULES
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# HOOKS="base udev autodetect ide scsi sata filesystems"
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## No autodetection is done.
# HOOKS="base udev pata scsi sata usb filesystems"
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# HOOKS="base udev pata mdadm encrypt filesystems"
## This setup loads an lvm2 volume group on a usb device.
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HOOKS="base udev autodetect pata scsi sata resume filesystems usbinput"
# COMPRESSION
# Use this to compress the initramfs image. With kernels earlier than
# 2.6.30, only gzip is supported, which is also the default. Newer kernels
# support gzip, bzip2 and lzma. Kernels 2.6.38 and later support xz
# compression.
#COMPRESSION="gzip"
#COMPRESSION="bzip2"
#COMPRESSION="lzma"
#COMPRESSION="xz"
#COMPRESSION="lzop"
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# Additional options for the compressor
#COMPRESSION_OPTIONS=""
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fstab.conf:
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
none /tmp tmpfs nodev,nosuid,noatime,size=2000M,mode=1777 0 0
/dev/sda1 / ext4 defaults,noatime,discard 0 1
/dev/sda2 /home ext4 defaults,noatime,discard 0 2
/dev/sdc1 /boot ext4 defaults 0 1
/dev/sdc2 /var ext4 defaults 0 0
/dev/sdc3 swap swap defaults 0 0
/dev/sdc4 /media/data ext4 defaults 0 0
shm /dev/shm tmpfs nodev,nosuid,size=10G 0 0
Is wicd causing these problems or did I configure something else improperly? Would appreciate any help to get eth0 up again!
Last edited by TheBigCow7 (2011-09-13 17:57:20)

Ok, I think I've made some progress! Hibernate definitely affects my network connection. Could this be a kernel 3.0 problem?
I noticed that ifconfig showed eth0 without an inet addr, just an inet6 addr for the longest time. e1000e seemed to be loading up ok. I'm not certain here, but I think that meant the dhcp settings didn't stick, or something along those lines.
Trying to use dhcpcd like the instructions here did not work. By some chance, one attempt did work and while it did, I downloaded and installed dhclient. After that one successful attempt, renewing the DHCP lease via dhcpcd did not work again.
Luckily though, I found that running "dhclient eth0" worked. My DHCP settings seemed to have somehow gotten messed up after my initial, problematic hibernate to the point where none would stick, even after a reboot. Manually typing in "dhclient eth0" would get eth0 working, so I decided to add it to the bottom of /etc/rc.local, like in the example on the networking page.
Now, eth0 works after a boot. However, after the daemons load up during the boot process, my computer takes a long time to get to the login prompt (this is relatively speaking, since I am on a SSD and the boot process used to be blazing fast before). I'm pretty sure it's because I added "dhclient eth0" to /etc/rc.local.
I should say that even with these changes, after a hibernate, my eth0 still does not work and if it weren't for the edit to /etc/rc.local, eth0's inet settings would still not stick after a reboot (that is to say, the hibernate does do something to my network settings).
Is this the correct/most efficient way to fix my DHCP problem? Can I fix my "eth0 after hibernate" issue? Also, can I make my DHCP settings boot up without changes to /etc/rc.local so that I can get a fast boot again (still not sure how it was able to work before without my edit)?

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IMac - Display doesn´t work after restart

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