At first when I turned on my computer I would be able to sign into my account and be able to get on the internet and maybe one website, the computer would completley freeze and I would have to forcefully shut my computer down because not even the task manager would come up at this point. If that didn't happen it would come up and then shut itself down for no apparent reason. I thought it was something loose so I unplugged the computer and then plugged it back up. Now the power light that would turn bright blue when turned on does not come on at all, but the fans, and the lights indicating the CD/DVD burner and CD ROM come on. The monitor reads that it is at least plugged in but no signal is going to it and it goes to power saving mode. I was told of a few options that could be causing the issue like the heat sink being metal to metal, so I put some thermal paste on it. no change. I was told to remove the ram and then turn on the computer and that there should be a series of beeps, no beeps at all, so could it be the mobo or is there anything else I could be missing? I've checked all wires to make sure they weren't loose, I replaced the small battery (looks kinda like a watch battery) with one from a vaio i had, the serial numbers were the exact same and everything and I know the vaio works, it just needs a new hard drive that isn't a sata like the HP one. the computer itself is about 4-5 years old but the power supply is 2 years old, the graphics card is 2-2.5 years old, the ram 1 year old, the hard drive is also a year old. If anyone knows what is wrong with my desktop let me know before I end up buying a new computer.