Member Avatar for Ste121

at the weekend i decided to tidy my computer area. I unplugged everything from my computer positioned things where i wanted them and then plugged it all back. Just because i was sick of having wires showing and looking a mess.

Anyway.

When i turned the computer back on every thing seemed fine untill just befor the log in screen should of appeared. At that point the screen went black and my monitor started flashing No Signal. i tryed restarting the computer a number of times and got the same problem over and over.

I then tried restarting it again and pressing F8 in an attempt to run in safe mode, when the screen came up with the options to run in safe mode i was not able to move the highlighted bar thing to select the option i want? All that happens is the timer at the bottom runs out and then the screen goes on to saying No Signal?


What can i do to sort this? i am not able to get on to my log in screen because it goes to no signal before then. and i am not able to run in safe mode because i cannot select a option

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A few focused checks will usually turn this kind of problem into a quick fix. , because the machine boots far enough to show the F8 menu and then the monitor reports "No Signal", the most likely causes are (A) the display output switches or fails when Windows loads its full video driver, or (B) the keyboard/USB is not being seen so you cannot pick Safe Mode. was right to suspect loose wiring; pointed toward BIOS reset — both lines of thinking are useful, but here are concrete, non‑repeated steps to try next.

Quick checklist to try first:

  • Confirm the monitor cable is plugged into the same output you used for BIOS/POST. If the system has both a discrete GPU and onboard video, try moving the monitor cable to the other output to see if the desktop appears.
  • Check the graphics card power: if the card needs a 6/8‑pin PCIe power lead, make sure it is fully seated.
  • Swap the video cable and/or try a different monitor or TV to rule out the display/cable.
  • Fix the F8/keyboard problem: plug the keyboard into a rear motherboard USB port or use a PS/2 keyboard (or a different USB keyboard). Remove front‑panel hubs, wireless receivers or extra USB devices.
  • Remove nonessential USB devices before booting (one bad device can block early USB input).

If those don’t help, do the hardware reseat and BIOS-clear safely: power off, unplug the PSU, press and hold the power button 10 seconds, ground yourself, then reseat the GPU and check connectors. Use the motherboard’s CMOS clear jumper (preferred) or remove the coin cell only after power is removed. After that, try to enter BIOS and enable USB legacy support so the keyboard works at F8. If the display still dies only once Windows loads, the display driver or the GPU itself is likely at fault — test the card in another PC or boot a Linux/utility USB to confirm whether a desktop appears outside Windows. If none of this helps, post exact motherboard, GPU and monitor models and which cable/port you used.

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Member Avatar for cguan_77

double check what you had unplugged..or it could be loose connection.. basically if monitor display no signal then there's no data coming out from your video card.. any jumper settings you had changed?

Member Avatar for Bob_180_Bob

Logic dictates that you caused the problem when you moved everything. There is not a lot of things that will allow you to get as far as your F8 screen and no further.
First up, try removing your motherboard battery for 3 minutes and then replace and boot up. You should be asked to press F2 or something to set up your BIOS again. Enter BIOS and set defaults, save and reboot and see if you still have a problem.
This would be a good time to have a Ultimate Boot CD.....

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