Constant screen refresh when restarting after installation of mountain lion

I've just installed mountain lion . When it restarts I get the main screen then it has a green tint then reddish then refreshes and starts all over again.  I left it on all night ant it was still doing the same in the morning.
Restarted in safe mode, disc is fine showing no errors.
I have re-installed lion using time machine and all is well.
Any help would be greatly appreciated

Don't quote me on this, but I think that the rules may have changed for Mountain Lion and you may need either 2 matching pairs or at least matching modules installed in both bottom slots.
as per > iMac: How to remove or install memory
Additional notes i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot. Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ("Top" and "bottom" slots refer to the orientation of the slots in the pictures below. "Top" refers to the slots closest to the display; "bottom" refers to the slots closest to the stand).

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