i have the same problem on 3 PS3 60 GB Models. If i will reset the PS3's , it's doesn't work. When I hold the Power button the System will not give the 3 Signals who calls that the reset is done. (on an PS3 with soft Brick the Reset is WORKING, on an PS3 with Harware problem its dosn't WORK)
I Reflow the GPU and the CPU with liquid Flux and a temp. of MAX 230 C on the Die or the Headspread and the Mainboard at 110-120 C, but the problem was not fixed. The same problem as before, Green LED and no Sound or Video.
At the last I start the PS3s and let it on for more then a 60 min. (to haet up the Mainboard and the Chips) reset it more times and than... on 2 PS3 i have a Video signal and sound!!!
The problem solving is a Reball the GPU. Only a Reflow dosen't work or it work for a short time.
The Green lod with this symptoms is the same like YLOD. Its an contact problem from the plumb under the GPU.
Hope I can help.