Didnt hurt the first time

So I did my first "real" OC today. Running my 2400 @ 2245 (140x16) @ 1.7V. Stable so far (couple hrs of P95)
Question- Anything above 140 and I get no boot. Is this my memory? Its only PC2100, so I know I need to upgrade it.

Probably, 133 FSB is specs for 2100.
You get 166 FSB with PC2700.

PC2100 overclocks to 150ish FSB at the most when generic cheap RAM is concerned.

Did you set your DIMM Voltage Regulator to 2.77V or higher?
Did you try relaxing RAM timings?

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2100+ AIUHB 0248 MPMW
256MB Crucial PC2100 + 2x 256MB Kingston (Hynix chip) PC2100 @ 6 3 3 2
[152] FSB x 15 = 2280 MHz @ 1.8 Vcore with memory frequency at 100% [152] @ 2.77 Vdimm
37(min) C to 46(max) C Winter ; 42(min) C to 50(max) C Summer
Epox 8RDA+
Thermalright SK-7 with variable speed 80x25mm YS-Tech FD1281259B-2F
BFG GeForce4 Ti4200 8X 128MB; Antec SX-835II case ; 350W Antec SmartPower SL350

lower the multipiler and up the fbs that will tell u if its the fbs