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Ashik, Mac Technician
Category: Mac
Satisfied Customers: 11058
Experience:  Bachelor of Computer Application (BCA), 9+ Years of Experience in troubleshooting Macs, iPhone, iPad, iPod etc
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Problems with imac screen. Keeps going black. Have to fiddle

Resolved Question:

Problems with imac screen. Keeps going black. Have to fiddle with cable leading to router. Tried replacing cable but it made no difference. Very annoying. Every time it is on sleep I have problems with screen recovery and sometimes it goes black even when I am typing.
Submitted: 7 years ago.
Category: Mac
Expert:  Ashik replied 7 years ago.
Hi My name isXXXXX hope i can help you.

Is this is a iMac G5 ?
Customer: replied 7 years ago.
21.5" 500gb MB950B/A
Expert:  Ashik replied 7 years ago.
Which model of iMac ? Intel or PPC ?
Customer: replied 7 years ago.
3.06 GHz Intel Core 2 Duo
Memory 4 GB 1067 MHz RAM
Expert:  Ashik replied 7 years ago.
Sorry for the delay...we can try to reset the PRAM and NVRAM and SMC (System Management Controller) of your Mac.

Reset SMC (System Management Controller)
  1. Shut down the computer.
  2. Unplug the computer's power cord.
  3. Press and hold the power button for 6 seconds.
  4. Release the power button.
  5. Attach the computers power cable.
  6. Press the power button to turn on the computer.

Then reset the PRAM and NVRAM:

Reset PRAM and NVRAM
  1. Shut down your iMac
  2. Locate the following keys on the keyboard: Command, Option, P, and R.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears and before the chime sound.
  5. Hold the keys down until the computer restarts and you hear the startup sound for three times.
  6. Release the keys.

Now see if your screen keep going black or not..Let me know.
Ashik and 3 other Mac Specialists are ready to help you