MacBook Pro (Mid 2010) hard freezes a few seconds after boot

in Genius Bar edited March 9
MacBook Pro (15-inch, Mid 2010, A1286, MC371LL/A, MacBookPro6,2)
Intel Core i5-520M 2.4 GHz Dual-Core
2x 2 GB DDR3-1066 (PC3-8500)
NVIDIA GeForce GT 330M 256 MB

I get hard freezes within seconds of booting (sometimes I need to hold the power button down to turn it off, sometimes it auto-reboots).

Safe Mode works for as long as I want.

I have applied MBPMid2010_GPUFix v0.6.1, to no avail.

I ran two test sequences in memtest86 ('memtest all 2') and everything came back clear.

Any ideas?
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