2.2.1x Kernel Building Problems

rips asks: "I've been a moderately skilled Linux user for several years now but my problem solving skills on this one have got me stumped. I have compiled many kernels before but when compiling a recent kernel (2.2.11 or 2.2.12) the compilation will run without a hitch, lilo (v20) will accept the changes but after a reboot the system will crash at: 'Uncompressing Linux... Ok'. I have tried compiling the 2.2.12 kernel on 3 different machines with 2 different distributions (RedHat 6.0 and Slackware 3.2.0) and for different target processors and kernel options but nothing seems to work. I've even tried running off a boot disk incase it was LILO but to no avail. This has really got me stumped. Has anyone else figured out the cause/solution to this?"