Long story short, replaced the MB in a Dell 1747 which ended up not being the issue- CPU was the issue but had 4 beeps, replaced CPU with a I7-920 that I had on hand to see if it would work- it does. This laptop's cooling is marginal as I tried the 920 a few years ago and had some overheating issues when it was pushed. I have tweaked the cooling system but it is an unknown at this point and I will see how things shake out and will try not stress cpu. To replace the unit is $$ for 17in, I've upgraded to SSD drives and maxed the ram. What are a couple replacements for the I7-720, I can pull a 720 off of fleabay for $40, but wondering if a lower rated I5 or dual core may actually be a faster choice for a G1 socket. General use, no gaming.