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rutlandictFlag for United Kingdom of Great Britain and Northern Ireland asked on

Just changed HDD but cannot get a display. Sounds asthough its running, can take CD's.

Opened up to replace HDD, all cables re-connected. Power Mac on and it sounds asthough its running but can't see any display. Replaced HDD with standard IDE, not aware they require special HDD's? Not particularly familiar with Macs, understand you need to hold down 'c' to run system disk to load OS.  But no sign of anything trying to appear or display.

Apple HardwareApple OS

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8/22/2022 - Mon

The HDD you bought will have been formatted in a PC format like FAT32 or NTFS by default. You will have to reformat it to the current Mac format, HFS+ Journalled, by booting from a Mac OS X install CD and choosing Disk Utility from the menubar. Then install OS X>

Ok great, but how do i boot from the OS X CD? can't see anything on the screen. The OS X CD is in the drive, tried holding down 'c' on the keyboard but nothing happens. No display at all.


What type of Mac is it? You should see the boot screen (grey apple logo) regardless of what is happening with the disk, and it should be able to boot with a CD also.

If you are getting nothing on the display, the chances are that there is a problem with the display cable.

If it is a laptop, make sure that the display cable is connected properly. You could also boot it up with an external monitor on it, which should give you a display.

If it is a MacPro, check that the external monitor cable is connected properly.

If it is an iMac, treat as a laptop - check any cables you might have disturbed, and try checking with an external monitor.


Your help has saved me hundreds of hours of internet surfing.

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The PMU is a good point I neglected to inlude.  You may also want to reset your PRAM.