Chosen Solution

what is mean Apple extended hardware test error codes 4NSN /1/40000000:TH00-9.00 Update (08/24/2017) iMac 27" 2.66 GHz intel Core i5 Memory 8 GB 1067 MHz DDR3 Mac OS-X 10.6.8 I changed the hard drive with this: WDC WD1005FBYZ-01YCBB1 Capacity: 1 TB (1,000,204,886,016 bytes)Model: WDC WD1005FBYZ-01YCBB1Revision: RR04Native Command Queuing: YesQueue Depth: 32Removable Media: NoDetachable Drive: NoBSD Name: disk0Rotational Rate: 7200Medium Type: RotationalPartition Map Type: GPT (GUID Partition Table)S.M.A.R.T. status: VerifiedCapacity: 209.7 MB (209,715,200 bytes)Writable: YesWritable: YesFile System: Journaled HFS+BSD Name: disk0s2Mount Point: / more about the new disk : HDD WESTERN DIGITAL WD1005FBYZ GOLD DATACENTER HARD DRIVE Χωρητικότητα: 1 TB. Interface: SATA III 6 Gb/s.Form Factor: 3.5"Windows, Windows Server, Linux και Mac OS.RoHS Compliant: YesRate (max) Buffer to Host: 6 Gb/s.Host to/from drive: 200 MB / s.Cache: 128 MB.Rotational speed 7200 rpm. Please can you help me to understand and fix this problem Thank you!!!

@ellana - Sadly your system can only support a SATA II (3.0 Gb/s) drive. This drive is to fast for your system. You will need to find an older drive or one that offers speed sense technology like the Seagate FireCuda. Here is the spec sheet for it: FireCuda 3.5 SSHD. Note the SATA interface lists your system speed unlike the WD drive.

Please give us your exact model. Did you change the hard drive?

Hi mayer I need your help again please My imac has problem with his graphics Radeon HD 4850: Chipset Model: ATI Radeon HD 4850 Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 512 MB Vendor: ATI (0x1002) Device ID: 0x944a Revision ID: 0x0000 ROM Revision: 113-B9110C-425 EFI Driver Version: 01.00.383 Displays: iMac: Resolution: 2560 x 1440 Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes Connection Type: DisplayPort Display Connector: Status: No Display Connected I send it to apple service 2 times but they can not repair it and they can not find a new one to change it and the computer the screen has small vertical lines that flicker, a week ago it was the same and when it closed it did not open again. The screen was black Please help me Thank you