is it x050 as you indicate or 0x50 (0x00000050: PAGE_FAULT_IN_NONPAGED_AREA) ?
If the latter, which I am betting, it generally indicates a problem with RAM (which includes L2 RAM cache, video RAM in addition to the system RAM) or a bad or corrupt driver. Look the blue screen over carefully and see if it references a file with a SYS extension and let us know.
Long story short: Older computer running Windows XP. Keeps rebooting to blak screen with the Safe Mode option. Choosing F11 for recovery triggers BSOD with code x050. All solutions I've seen so far require starting the computer in Safe Mode but this only returns me back to the black Safe Mode screen. Chasing my tail. Any ideas?