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New PSU. Windows 7 Hangs on Start Up. Can Only Access Safe Mode

Last response: in Windows 7
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March 6, 2014 2:38:21 AM

My PSU died and shutdown my computer whilst I was on the desktop in Windows 7.

PSU has been replaced but now I can only boot into Safe Mode.
When trying to access Windows 7 normally it hangs at the start up screen (during the animating/pulsing Windows logo).

In safe mode I have been unsuccessful in loading a previous restore point. I also can't reinstall Windows (using the disc) - it starts loading but when the computer restarts it then hangs again.

I have reset my bios.
I have an other wise clean computer, no viruses etc.

I have tried installing onto a new drive (with all other drives taken out) and again it hangs.

As a new drive doesn't work and it still hangs I am thinking it is possibly a hardware fault (the PSU dying affected something else too??) yet, in my limited knowledge, I don't understand why Safe Mode works and is stable.

I've spent the best part of 5 hours on this problem, having searched this site/the internet for solutions before I posted. I am now at a loss.

Any help would be greatly appreciated.
a c 122 ) Power supply
a b $ Windows 7
March 6, 2014 2:48:34 AM

Can you post the full specs?
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a b ) Power supply
a b $ Windows 7
March 6, 2014 2:49:54 AM

it may have zapped your gpu or other part in the pc. if your pc has onboard video I would pull the gpu and see if the windows will load. if not go into the bios turn off everything but keyboard and mouse. also check that the 4/8 pin power plug is connected if it not the gpu wont have the power it needs to run.
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March 6, 2014 3:59:11 AM

i5 760
16GB ram.
HD5770 Radeon
P755d LE Motherboard.

Am at work atm so I'll be more specific, if needed, when Im back.

I don't have an onboard video. I have checked connections. There is an option to boot into Windows 7 in normal mode with a low resolution - it still hung on that.

I shall try turning everything off in the BIOS. What exactly is 'everything'?

Thanks for the help so far.
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a b ) Power supply
March 6, 2014 4:27:43 AM

You said you that you installed a new drive. Did you have the drive originally set up for AHCI or IDE? If so you may need to switch to IDE mode, or vice versa in your bios to load windows normally. When you reset your bios it may of switched causing windows to hang on startup. Hope this helps.
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March 6, 2014 4:50:24 AM

I had read up about AHCI IDE.

I had no luck changing the previous drive around although I have only tried installing Windows 7 on the new drive in IDE mode. I shall try AHCI. Thanks.
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March 7, 2014 6:00:58 AM

Sorted. Can't pinpoint the exact point I fixed it but I was swapping the ram around. Now just got one stick in and windows loaded fine. Will test the other 3 sticks when I've confirmed Windows is stable.

Does it make sense that ram could be affected by a PSU outage?
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a c 122 ) Power supply
a b $ Windows 7
March 7, 2014 6:17:26 AM

Not really, but with sufficient ripple any unlikely scenario is possible.
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March 8, 2014 5:49:32 AM

Adding in the other 3 sticks of RAM caused the computer to hang again. So I took them back out. Added one at a time and it all worked. Although I noticed that when all 4 sticks were in my Installed RAM and Usable were different. 12gb installed and 5.99 usable. I reseated and swapped around 2 sticks and that solved the problem.

Seems slightly odd to me. Hopefully I just didnt seat them correctly the first time round (although windows did recognize all 12gb) and it's not an underlying problem.
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