2009 iMac Blue lines and crashing - Apple replaced graphics card but same problem occurs? Any advice?

Hi all,
So Ive had my iMac 2009 model for a fair few years, and barring getting the hard drive replaced a while part as part of their program, no troubles. Then a month or less ago, I got this weird crash during work. Small cubes of vertical blue lines appeared all over the display and froze everything. The arrow cursor still moved but had to hard reset. Then it would just constantly freeze and the blue cubes appeared again on startup so I could only get in using Safe Mode.
After browsing the web, I heard a backup restore might fix it, which it seemed to, but then it kicked in again. Took it to Apple who could see no hardware issues and the problem didnt occur while I was there because of the restore, it was more intermittent. So I took it home and it happened again.
This time at the Apple Store, they told me it was definitely the graphics card and took it in for repair. Service was great and a few days later I get it back, pay for the repair and come home. All fine and no problem for a couple weeks.
Yesterday it kicks in again! Same problem, cant boot at all outside of Safe Mode, which is erratic, has 5 columns of blue lines across the screen and Mail flickers like ****.
Ive booked it in AGAIN at my local store to check, but my question is does anyone have experience of what this could be, and also if the first repair was wrongly diagnosed and didnt fix the problem, will Apple refund that, or offset it against the actual repair if something else needs replacing?
Any help or insight would be greatly appreciated, all the best!
Leo

new card or not, I guess only Apple themselve will know, but Apple Authorised Service Centre can only replace with original card. you may consider to get your fan replaced too, as your iMac is getting old now and the fan might be getting weak to cool your system down.
well, this is only a suggestion. I've been an IT technician for years, and I do encountered graphic card keeps failing till we changed the fan, just sharing my experience.

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