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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Black screen, loud fan after hdd replacement.

After replacing the hdd in my iMac and booting it back on there was a white screen with a folder indicating that there was no hdd. I opened her back up checked connections and then followed them as far as I could.

I ended up taking out the logic board to see that all cables were connected and working. I'm not sure what to do now at this point. I have a wired mouse but no keyboard connected to this computer. I have a wireless keyboard but it's paired with another iMac while putting this one back together.

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Can you give us the last four digits of your serial number so we can identify which model you have.


Bottom of the stand says KDB5


I have same issue No Display on iMac LCD , but its working fine on external Monitor. Already I have second one (iMac) and I swapped all the parts one by one but the second one still working fine with all of the first one parts and the first one still not display on LCD. ???


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Lets put your computer back together so you are back with the white screen with the question mark.

Once you get to that point we are very close in getting things working.

OK, now we need a bootable drive to finish the install. Is the HD you took out working? If so we could use it. In this case you'll need a SATA to USB adapter cable like this one: USB 2.0 to SATA/IDE Combo Adapter. Using it we can boot up your system to finish the process.

If you don't have a working drive you'll need to create one. Using a friends Mac and a USB flash drive you can use the OS installer to install a bootable OS onto the flash drive. Then copy over the OS installer to it and using it on your mac you should be able to boot up your system and then using the OS installer thats on it install the OS onto your new HD.


Sadly I have some bad news here ;-{

Your systems SATA port is only SATA II (3.0 Gb/s). The drive you got a Western Digital Caviar Blue 1 TB is a fixed SATA III (6.0 Gb/s) drive. For your reference click on the link above for your system and here's the drives spec sheet: WD Blue Desktop Hard Drives.

This drive won't work in your system as the SATA I/O speed is too fast.

You also have a second problem here:

This series uses a special cable to access the internal thermal sensor within the HD. You need to use the same vendor of HD as the replacement (Seagate for a Seagate, etc...). So depending on what your system came with you'll need to match up the SAME vendor as the cable is different from vendor to vendor Apple used.

As it turns out you can replace the cable! So if you want to change the drive out to a different vendor you can, its a bit more work and you'll need to order it matching it up to your SATA II drive you are getting.

Cable, Temp Sensor, Hard Drive

922-9223 - Hitachi Drive

922-9224 - Seagate Drive

922-9225 - Western Digital Drive

OK, So far we've gone over why your drive won't work and why your fan's go into high gear.

Lets see if we can find a better drive for you. Again, you do need to match up the vendor unless you swap out the cable.

So lets say you had a Seagate drive then I would go with a Seagate SSHD drive. Here's a description of the drive: Seagate Desktop SSHD, and here is the spec sheet for it: Seagate Desktop SSHD spec sheet. Whats important here is checking out this line: "SATA Transfer Rates Supported (Gb/s)" note it offers SATA III, II & I support "6.0/3.0/1.5" so its a perfect fit for you and you'll get the zip of a SSD and yet the deep storage of a traditional HD.

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Apologies... I didn't say everything. The old hdd is shot. I got a new one and made a bootable clone from another iMac. Worked and booted up fine via usb. I installed it and it acted like it wasn't there which led me to taking the whole thing apart again.


Ok not sure if it would have done it or not but I realized that I left out the ram. Put it back in and. Ow I got the screen back with the flashing folder with a question mark on it. Could it be a bad cable if I already know that this is a working bootable hd?


And still have a loud fan.


I need to know what your exact system is (see above) and I need to know who's drive you put in (make & model) to help you more.


The os that I cloned was on 10.7.2. I have a boot disk for 10.5 and 10.6 neither seem to be able to get me past the white screen with an apple logo. The new hdd is a wd caviar blue 1tb. Last 4 of serial is KDB5. Let me know if you need anything else.


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