Imac display only white with purple lines will not boot

iMac mid 2010. went white then after forced restart keep repeating startup sound. After several times repeating attemt at restart makes sound once then screen is white with purple vertical lines.
tried removing power cord for 60 seconds

Hello sprdthewrd,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Best of luck,
Mario

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