My Dell Insprion will not start sometimes. When I push the power button it tries to start and the fans will try to turn. I can get it to start by TURNING the power strip off and holding the power button on the computer until it GLOWS orange then turning the power strip back on. I have replaced the CMOS battery, I have run the Dell Diagnostics and the motherboard and components checked OK. I have removed and replaced the memory, video card, keyboard, mouse, fans and drives. When I reinstalled each peice one by one the computer would start, but SLOWER each time. I have not tested the power supply yet.Borrow a known good PSU of the same or greater wattage and swap it in there overnite...I had the power supply checked and it is good. Now everytime I shut the power off the CMOS resrets itself.1 of 3 things:
1.  Power Supply is no good.
2.  CMOS battery is no good.
3.  Motherboard is no good.Does anyone KNOW where to get a motherboard cheap to replace a dell insprion 530?Owner's MANUAL
See p. 85

Dell™ Inspiron™ 530 Series Owner's Manual - Specifications

http://support.dell.com/support/edocs/systems/inspd530/en/index.htm