Imac's screen turn into blue screen

Question

I bought my iMac @ July 2008, the imac running just fine.....but some how since last month, my mac will suddenly turn into blue screen for couple seconds then turn it back to normal ....
I tried to format the iMac , Blue screen problem still access .....
Can some one tell me what should I do to fix this problem ???

Answer 1

HI Brian and Welcome to Apple Discussions ...
You tried to reformat the iMac without success? Did you boot from the restore disk and verify the disk for errors first? If not...
Restart your Mac while holding down the C key, pressing the power button and inserting your restore disk all at the same time. An Installer window will open, but do not proceed with any installations. Instead, from the Menu Bar, select Utilities > Disk Utility. In the Disk Utility window click First Aid, and then click Verify. If Disk Utility reports errors, click Repair. When Disk Utility is finished, from the Menu Bar, select Utilities/Startup Disk. Select MacintoshHD 10.x.x and click Restart.
To check your hard disk’s S.M.A.R.T. status: Open Disk Utility, in the Utilities folder in the Applications folder.Select the disk in the list at the left, and look at the bottom of the window for a field named “S.M.A.R.T. Status.” Make certain it says; Verified If not, there's a problem with the boot disk.
If Disk Utility reports errors it cannot fix, you have several options. You can get DiskWarrior or TechToolPro to repair the directory. The other option is to locate an Apple store or an Apple certified repair shop.
You can also use Disk Utility to check to see how much free space there is. Select MacintoshHD 10.x.x on the left of the window, then look at the bottom of the DU window. The Capacity and Available disk space will be displayed there. Never allow the free disk space to fall below 10%, 15% is better. Insufficient available space, can cause performance issues, system corruption, and possible loss of data.
Carolyn