Boot problems with ASRock Z87 Extreme4

My computer has an AeroCool KCAS-700W PSU, the ASRock Z87 Extreme4 motherboard, Intel i7 4770k processor and 2x8GB Corsair Vengeance memory sticks. It has been working fine for at least a few months since the last hardware change.

Usually my computer runs 24/7, so the problem could have gone unnoticed for a while. During the last few reboots I started noticing that it takes some time to start booting. Fans start spinning, but the screen is black and nothing happens. After some time it starts booting from there without my interference. After it does boot, the computer works fine.

Today I had to reboot my computer a couple of times and realized that this is a big problem. Sometimes it sits at the black screen for a few minutes or more.

I started investigating the problem and here are some facts:

During the "black screen" stage the indicator on the motherboard switches between codes 4F and 15. I couldn't find definitive explanations as to what this means.

If I remove either of the two memory sticks, it doesn't just sit at the black screen, it restarts every 5 seconds or so. During this process the indicator switches between 4F code and some other (don't want to shut down the computer now to check). Tried changing slots too.

If I remove both memory sticks, I get the 53 code, which I found to mean that there was no RAM memory found (as expected).

Tried removing the video card, hard drives, everything plugged into the computer (usb, headphones, etc.). Still getting the same behavior.

I tried removing the motherboard battery for a few minutes, didn't help.

Tried cleaning contacts on the battery, on the RAM sticks, etc. Didn't help.

I am sure I didn't have this problem a couple of weeks ago, bootup always used to be very quick. And there were no hardware changes since then.

Right now the only thing I can do is minimize system reboots, but it doesn't seem like a good permanent solution. Please suggest what I can do.

Thanks!

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sashamur Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 08 Sep 2015 Status: Offline Points: 4	Post Options Post Reply Quote sashamur Report Post Thanks(0) Quote Reply Posted: 13 Sep 2015 at 7:56pm
	Still keeping my computer on without reboots Any suggestions?

sashamur Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 08 Sep 2015 Status: Offline Points: 4	Post Options Post Reply Quote sashamur Report Post Thanks(0) Quote Reply Posted: 08 Sep 2015 at 4:31pm
	My computer has an AeroCool KCAS-700W PSU, the ASRock Z87 Extreme4 motherboard, Intel i7 4770k processor and 2x8GB Corsair Vengeance memory sticks. It has been working fine for at least a few months since the last hardware change. Usually my computer runs 24/7, so the problem could have gone unnoticed for a while. During the last few reboots I started noticing that it takes some time to start booting. Fans start spinning, but the screen is black and nothing happens. After some time it starts booting from there without my interference. After it does boot, the computer works fine. Today I had to reboot my computer a couple of times and realized that this is a big problem. Sometimes it sits at the black screen for a few minutes or more. I started investigating the problem and here are some facts: During the "black screen" stage the indicator on the motherboard switches between codes 4F and 15. I couldn't find definitive explanations as to what this means. If I remove either of the two memory sticks, it doesn't just sit at the black screen, it restarts every 5 seconds or so. During this process the indicator switches between 4F code and some other (don't want to shut down the computer now to check). Tried changing slots too. If I remove both memory sticks, I get the 53 code, which I found to mean that there was no RAM memory found (as expected). Tried removing the video card, hard drives, everything plugged into the computer (usb, headphones, etc.). Still getting the same behavior. I tried removing the motherboard battery for a few minutes, didn't help. Tried cleaning contacts on the battery, on the RAM sticks, etc. Didn't help. I am sure I didn't have this problem a couple of weeks ago, bootup always used to be very quick. And there were no hardware changes since then. Right now the only thing I can do is minimize system reboots, but it doesn't seem like a good permanent solution. Please suggest what I can do. Thanks!