Endless Reboot, no POST, no beep!

eagle2401

Honorable
Jun 7, 2013
2
0
10,510
Intel Quad 2 x4 @2.5Ghz
Antec 620w High Current Gamer
XFX ATI Radeon 5870
1Tb Western Digital HDD
4 2Gb sticks of Apacer DDR2 RAM
Not sure about the motherboard! If you guys told me how to tell I'll let you know!

I can't get my computer to POST! Basically I start it and then the CPU fan starts spinning, but after a few seconds it stops, then resets.

When my computer first started going bad, it was working, I just couldn't get windows to launch and the startup repair kept crashing. So I Ran memtest86 and it seemed mostly clean. I think their might of been a stick going bad, but after removing it, I still can't get it to work. And now it won't even post.

I hooked up the motherboard speaker and it isn't beeping. Not even with the RAM taken out of it. So I think that means its the PSU, the CPU, or the Motherboard is bad, right? Pretty sure that's what you need for motherboard beeps.
I switched out the PSU with another one and still had the same problem. So I think I narrowed it down to CPU, Motherboard. I Switched out the CMOS Battery, to no avail. I'm guessing that means CPU or motherboard? :/

Also took out my videocard and tried booting with the on-board HDMI, still nothing came up.

Thanks! Really appreciate the help! I'm not too good at this hardware stuff:/

EDIT: I was asleep when my computer crashed for the first time, and my GF ran startup repair and left it on all night. Before my computer started going really bad, I looked at the temperature in BIOS. Motherboard was at 53C and CPU was at 80C. Obviously I need to get some better cooling, but do you guys think that's what caused all this?
 

FAMDUCK

Honorable
May 18, 2013
61
0
10,660
If the CPU was bad and mobo good, then you would see something pop up on your monitor and possibly even go into BIOS. At the very least, you will see a splash screen and an error.

If the mobo is bad, then you won't see anything and it'll shut off.

There is also a small chance that it is both the CPU and mobo.

From what you are saying, the main suspect is the mobo. Might as well get a new CPU, board and DDR3 RAM.