Grey screen and continuous beeping (macbook pro 2010)

Hi, I unplugged my computer from its display/keyboard/HDD setup to use it portably and then upon waking it from sleep - it froze and a continuous beeping began from within the computer.
When I started the computer I get the bong and white/grey screen (completely blank) and the beeping begins immediately. But thats as far as it goes.
I've looked online and there's a lot said about RAM related beeping but having removed the RAM i know this not to be the case as the beeping I hear is much quieter and far more regular than any of the loud RAM beeps.
Safe boot, pram reset and cmd s did nothing.
Any ideas whats wrong and how to solve?
Thanks

Hello there, whistler2014.
Sounds like you did some great troubleshooting already. You may just want to review the recommendations in the following Knowledge Base article to make sure you've covered all bases:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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