Extremely Slow Startup, Blue Screen, and Poor Performance

Hello,
A couple of weeks ago my MBP 15" (late 2009 model) started performing really poorly. The colour wheel would spin for about 2 minutes if a launched any applications and everything was really slow. It also took about 10 minutes on the grey apple screen to startup and then another 10 or so on the blue screen before slowly revealiing my desktop.
I took it into the genius bar and the said it might be a corrupt file on the HD. Backed up my HD, zeroed the drive and reinstalled OS. Still the same problems. Ran disk utility several times and got various errors pertaining to HD or RAM.
Took it back into the Genius bar and they ran a long diagnostic on it, came back to me and said it is deifinatly the RAM. I replaced the ram, (2x2GB ddr3-1066 sodimm) and cleared PRam. Still the same startup and performance issues.
Any ideas would be appreciated as this is stressing me out big time as I dont know what else it could be?

SpennyT1 wrote:
Backed up my HD, zeroed the drive and reinstalled OS.
Hmm... before this I think I would have restarted the computer in Safe Boot mode which deletes the dynamic-loader shared cache.
Not sure if it is relevant at this point
Safe Boot
# it forces a directory check of the startup volume.
# It loads only required kernel extensions (some of the items in /System/Library/Extensions).
# In Mac OS X v10.3.9 or earlier, Safe Mode runs only Apple-installed startup items (such items may be installed either in /Library/StartupItems or in /System/Library/StartupItems; these are different than user-selected account login items).
# It disables all fonts other than those in /System/Library/Fonts (Mac OS X v10.4 or later).
# It moves to the Trash all font caches normally stored in /Library/Caches/com.apple.ATS/(uid)/ , where (uid) is a user ID number such as 501 (Mac OS X v10.4 or later).
# It disables all startup items and login items (Mac OS X v10.4 or later).
# Mac OS X v10.5.6 or later: A Safe Boot deletes the dynamic loader shared cache at (/var/db/dyld/). A cache with issues may cause a blue screen on startup, particularly after a Software Update. Restarting normally recreates this cache.
Message was edited by: leroydouglas
Did you run the Apple Hardware Test. What is the S.M.A.R.T. status, could be that HD is failing?

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Extremely Slow Startup, Blue Screen, and Poor Performance

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