|Why would you recommend a CMOS reset?|
The 8-pin plug powers the processor, without it, the CPU will receive no power & system will not boot. Had you made any changes just prior to this on/off cycling problem? If you did, try undoing the changes.
It's possible that your power supply is failing. Please post the make/model of your PC, your complete system specs (if you know them), & your power supply make/model & specs (not just wattage).
message edited by riider