4gigs of Gskill...no boot

[Ap1thy]

little late replay, but the 32-bit XP can only support up to 3.3333...GB of ram, so if vista is running a 64-bit install it will recognize everything fine, and if xp is 32-bit theres your problem. No idea what happened if both are 64-bit editions.

[Dilphat]

ima sound like a noob right now...so if it makes no sense then shoot me down..but are you sure you installed the OS's correctly. like how when you put windows and linux. linux is last. I'm not really sure if there is a sure thing order for vista and xp. but isn't i believe oldest to youngest?

[Bucko]

little late replay, but the 32-bit XP can only support up to 3.3333...GB of ram

Actually, it can support 4Gb of RAM.

[Silenced_Coyote]

One other long shot is to go into the boot.ini for Winxp (on the Root of the dive the xp is installed on) add /PAE at the end of the line that reads like this
multi(??)disk(??)rdisk(??)partition(??)\WINDOWS="M icrosoft Windows XP Professional" /fastdetect /NoExecute=OptIn

(The ?? should be numbers but there based on the number of Drives and which one XP is installed on...so I put the ?? to help avoid confusion)

This should let the system see the whole 4 Gb of Ram....This switch may cause issues If your running SP2 and DMA drivers (in 32 bit mode)....That's why I said it's a long shot.

Good Luck,
CrazyBillyBob

Doesn't this method run the risk of creating instability within Windows 32-bit. Does this not decrease the size of the kernel space which could lead to problems?