Soldato
I bought a cheap ThinkPad and just be aware that they were prone to overheating and shutting down at the slightest sniff of work.
I battled hard to even get it to clean install Windows 7 and I had to keep it downclocked to avoid the thermal trip with an i5 cpu.
If you've done a motherboard replacement you should be fine at least.
You must have had a bad one. I've a stack upstairs in my office to sell, probably 7 or 8 of them. We used them in a call centre, 40 of them.
All running windows 7, hammered day in and day out. I've never seen machines treated so badly. They had:
Missing keys
network port wires being completely mashed
drinks knocked over them
dropped
covered in stickers and food crumbs
They just kept going.
The only real issue I ever had with them was that they would boot up, show the splash screen and freeze. It was always down to mashed USB port wires touching. Use a lid from a biro, separate the USB pins and bang some tape over it to stop it being used. Booted up and carried on working. (Classy quality company can you tell? lol)