I have an older laptop (HP Pavilion ze4900) which I use for surfing while sitting on the couch. It's been dropped a couple of times, so the screen is going out periodically. I picked up a slightly newer model, HP ze5300, which had no HDD or wireless card or memory. I put the HDD, memory and wireless network card and memory into the new laptop, it won't POST with 1GB of memory. It POSTs and works just fine with two 256MB modules of memory, but won't POST with two 512MB of memory, or with one 512MB memory module. Both the 256MB modules and the 512MB modules are PC2700 DDR333. The 512MB modules are Corsair and I know they work just fine in the ze4900. Both the ze4900 and the ze5300 specs say that they both recognize 512MB memory modules and take up to 1GB of memory. I haven't tried to flash BIOS (can't find a floppy!) but it should not need a flash, it is supposed to support 1GB with the current BIOS. Any other ideas?