Is there any LED lights on PC? most common cause for this issue is a power supply or motherboard. Also the new hardware may operating at different wattage then the system board can handle cause the PC not to boot. i would remove HDD, Meida bay, Memory, Floppy drive (one at a time till PC turns on) till pc turns on or give an error code look on the back of front for diagnostic LED flashing or solid at all times.
I have a Dell Dimension 5150. I recently put a new hard drive in and the computer worked flawlessly.
Later, I purchased more RAM. When I installed the RAM and plugged the computer back in, there was a SLOW flashing orange light coming from the power button. I did some research and read something about USB pins. I inspected everything and they looked fine. I switched my USB connections to different USB inputs. The orange flash went away and the computer then turned on and worked flawlessly.
Last week, I put a new DVD burner in. After I installed it and then plugged the computer back in, I was met with another SLOW flashing orange light. After doing more research, I popped out the CMOS battery. When I plugged the computer back in, there was no flashing orange light and the computer power up for a few days and worked flawlessly.
I turned the computer off and now it won?t turn back on. When there is no CMOS battery, there is no orange flash and the computer won?t turn on. When I put two different CMOS batteries in (the old one and one from another computer), I am now met with a very FAST flashing orange light.
I have examined the mother board for corrosion and don?t seen any.
What should I try next?
Thanks for any help you can provide.