X-Ray Like Screen After Restarting

After i recently replaced my HDD , my macbook Late 2007 was working fine. Yesterday, when i started the laptop, it appeared that the screen was set to X-Ray view kind of screen. I checked if i had done any thing wrong in the universal access screen, i found everything to be normal. I did video RAM test, it passed. I resetted the PRAM, it worked well. Apple Hardware test was fine. Now, i can see only photographic kind of screen (like negative screen) on my macbook. I am unable to find any troubleshooting steps online also. Please help.