No Display when booting 9/10 times

[gbtg]

hey,

for a while i have been having the following problem:
when i boot my PC, at least 9 out of 10 times i will get no display on my monitor. fans will be running. no POST beeps.

after a few (or more) tries it will eventually boot corectly and my monitor gets a signal and everything is fine.
the computer will then run for hours w/o any problems until i shut it down. next day when i try to boot same thing happens again.

i noticed that whenever i get no signal, a small red LED in front of my PC will NOT light up. then, after turning it off and on again multiple times, eventually the red LED will light up, i get a display on my monitor and everything is fine. no idea what that LED is, i am guessing its from my harddrive? if the PC boots correctly, that LED will blink continuously at different intervals. not sure if it always did this or if it used to be always ON instead of blinking, before all this started.

when this first happened i tried removing my 2 RAM sticks. i got 3 POST beeps. so i put them back in and would get no display. i tried them separately and would eventually get a signal and a normal boot. since then i am using only one of the 2. not sure what happens if i put them both in again.

i also tried to reset my bios using the jumper thing on my MB. by doing so, all fans run at 100%. so after i got a successful boot (it took many tries again even after resetting my bios), i would go into bios and reduce the fan speed a bit. i then saved and exited the bios. the PC just turned off and not start on its own until i pressed the power on button (i think).

this is my MB: ASRock > H77 Pro4-M

i find it really strange that IF the PC boots correctly, it will run for hours w/o any problems. but the next time i try to boot it, i will not get a display. as i said, eventually after turning it on and off multiple times it would then work again.

could this be a problem with my PSU? if this is most likely, is there any way to confirm this w/o buying a new one? i do not have a 2nd one available to try it.

what else could be the problem and how might i go about fixing it?

thanks a lot.

 

[Mellon Head]

Welcome to the forums.

Please fill out your system specs as completely as you can so we have a better idea what kind of hardware we are dealing with.

 

[gbtg]

i filled in the stuff i know, i might have to look deeper into it, in case any specific information is needed. if so, which?

 

[Mellon Head]

i filled in the stuff i know, i might have to look deeper into it, in case any specific information is needed. if so, which?

The specific models of your graphics card and power supply would help, if you can provide them.

 

[gbtg]

added the PSU to my system specs.
not sure about the exact graphics card model.
i checked dxdiag and it does not tell me anything else. i might have to open up the PC and see if i can find any more information on the card itself. might be hard since i had to install a new graphics card cooler about half a year ago or so. also kinda reluctant to shutting down the PC since getting it to boot back up takes so long ill see what i can do next time i boot.

also, thanks for ur quick replies.

 

[Caslon]

lol, I had the same thing happen, it turns out the monitor cable to the back of the pc was not fully pushed in. It had come a little bit loose when I pulled the pc away from the wall to check something.

 

[gbtg]

lol, I had the same thing happen, it turns out the monitor cable to the back of the pc was not fully pushed in. It had come a little bit loose when I pulled the pc away from the wall to check something.

what i find strange though is that red LED on the fron panel of my PC that will not light up whenever i get "no signal" but once i DO get signal it will light up. pretty sure that led is connected to my harddrive.

also, if it was the monitor cable, why do i not get a signal 9/10 times when booting, but 1/10 it works fine and the pc will run for hours w/o problems. was this the case for you too? i would imagine if the cable wasnt plugged in correctly, that i would either get no signal ever, or the image would flicker or something.

oh, i just remembered: i already tried another monitor. didt work. unfortunately i do not think thats it.

 

[Mellon Head]

I think at this point you're going to have to open your PC and check all of the power supply connections and make sure that they are seated properly.

 

[gbtg]

ill do that again and report back.

 

[gbtg]

did not find any loose cables inside my PC.
do you guys think that my before-mentioned problem could cause any problems when updating from win7 to win10?
as i said, everything runs fine, only problem is restarting/booting, which simply results in "no signal" 9/10 times. will this interfere with win10 update and cause trouble?

 

[Mellon Head]

If it isn't booting 9 times out of 10 right now, I would put off the upgrade to Win 10 until you can find out what the problem is. It's starting to sound like you have a flaky power supply or motherboard.

 

[gbtg]

hey, did not read ur msg, i think i missed it because it went to page 2 and i thought noone had answered.

anyways, i didupdate to win10 a few days ago and everything went fine. still had the no signal problem when booting though.

couple days passed and today it got way worse: now, after trying to boot for a few times and only getting the "no signal", i now get a BSOD that says either "No bootable device found" or something along those lines, or it says something about automatic repair, PC did not start correctly, restarting might fix the problem. (my windows is not in english so thats a basic translation). after i click restart, i am basically back to square one where it will either show no signal, or one of the 2 BSODs.

would really appreciate any help. how do i figure out which of the components needs to be replaced?

 

[gbtg]

if it was the RAM that is causing the issue, would/could it stop the HDD LED from lighting up at all?

i guess the key to this problem is the fact that whenever i get NO signal and only fans move, the red harddrive LED is not lighting up at all, ever.
i would keep trying to power on / off and eventually the red LED would light up and i would get a signal on my monitor shortly after. and the PC would run for hours w/o any issue. i am really frustrated and do not understand what could be the reason for that.

edit: i noiced that in those cases that i would get no signal on my monitor and the red LED would not light up: when i would press/hold the reset button, chances are the red LED would light and signal would come.

since today in those cases i do no longer get into windows but would get the afforementioned BSOD

again more info: i have 2 RAM sticks, they both worked for a very long time. right now, if i use them both (installed into the right dual channel slows), i get 4 fast POST beeps. they work individually though, more or less (no post, often no signal, eventually a boot with signal).