Computer won't get to POST screen, turns off, restarts, rinse, repeat

Hardware Other Hardware
1

I am having a problem with my desktop right now, where I turn on my computer and turns itself suddenly, stays off for a few seconds, and then turns itself on again, only to turn itself off again, and this process keeps repeating itself until I force a hard shutdown. However, when I look inside the case while this is happening, I can see the fans spinning and LEDs lit just fine, business as usual.

Like the topic says, my computer does not reach/display the POST screen during this whole time.

There are a few suggestions (according to a friend of mine) as to what is going wrong with my computer and they are the following:

Your PSU is going bad.

I would think this is the case because I keep my computer running 24/7. The only time I would actually shut it down is when I am away for a weekend or longer. Plus the power supply I currently have is almost 3 years old, since I bought it in summer 2010.

The CPU, heatsink, RAM, connections need to be reseated/reconnected.

I have done all these yesterday and the problem still persists. I even made sure to ground myself as I was handling the hardware.

Anyways, do you guys have any other suggestions as to what's wrong with my computer? I need more information before I make any further attempts to fix it.

2

sounds like an overheating problem to me, have you cleaned your components recently?

3

I clean the inside of my PC once a month, and this month's cleaning was a week before this started happening.

4

Try starting it without ram, do you get the correct warning beeps?

Try maybe borrowing a cpu and see if the problem still persists.

Take out the graphics card and see if the problem continues.

Just try to narrow it down to the correct component.

5

Unfortunately, the motherboard speaker that came with my case does not work anymore, so I really can't answer this. I'm going to get a new one soon, though. However, I did try testing out all four sticks of RAM, seating them one at a time for each bootup. The problem still persisted through all four of the sticks.

I haven't tried using a different CPU to find out the problem, as I do not have any spare CPUs, nor do I know anyone that has spare CPUs.

I did at one point remove the graphics card and relied on the integrated chip and the problem still persists.

6

I had a pc that did the same and I just let it sit for a couple days and it usually would turn back on. IDK why it did that because i swapped the PSU, RAM and HDD. So I think it was the mobo going out. I didn't have another CPU so yeah. So after a while it wouldn't even turn on then it just died. RIP my first PC.