from personal experience when XP's hardware change limit is reached its gives a message on the welcome screen or during logon telling you to ring microsoft.
is a bit warm but shouldn't stop it from booting unless its the memory in any case i would try puting it down to 210 and see if it works. you should only go upa few at a time to work out its max stable speed. if it doesn't work at 210 then lower it again and se wot happens
topslop1: i'm...