Black screen and low power on startup

[jagobruford]

Can any one help with my start up problem?

For my desktop pc I have a power and boot up problem that does like this……….

Turn on main front power button

BIOS screens run through all OK

Windows startup screen runs OK (with the flashing green/yellow bar)

Then what normally happens is a pause of one or two seconds before the Windows iconappears and I can login.

What has been occurring recently is at this pause, the screen stays black and the computer goes into what can only be described as a low power mode. I sense this as the fan speed reduces, sometimes uneven and the screen stays black. Nothing else will happen.

BUT if I turn the pc off at the main power button at the rear and switch on again it will boot up, all through the processes with no problems. However if I do this at the stage above I have effectively forced a shut down and Windows enter via ther ecovery, but this still works fine. Windows etc works then with no problems atall.

Also if after shutting the PC down correctly I turn off the rear power button and turnit on before start up, all starts OK.

No devices are connected and powered on at start up other than Netgear router. I have disabled the devices (Control panel, Device manager, Properties) to “wake” the computer (mouse and keyboard) and also the Network Adapter, all of which were causingp roblems in waking the computer. This was a while ago and has been working fine for many months.

Any goodi deas would be appreciated. Could it be a software problem (drivers?) or ahardware problem (power supply?)

 

[Yard Dog]

Hello , Microsoft Fix it Solution Center: troubleshooting software issues In step 2, highlight the performance , errors or crashes and have it run some diagnostics for you.

 

[jagobruford]

Hi Yard Dog

Thanks for the reply.

I have tried the fixes you suggest but it has not had any effect. It did highlight a few minor things like screen saver, but I allowed these all to be rectifed. Any other ideas?

 

[jagobruford]

Hi Yard Dog

Thanks for your reply. I have tried the fixes you suggest and let these run. It has fixed a few minor issues like screen saver but the problem still remains. Any other ideas?