Win7 hangs at "starting..." after reconnecting the motherboard and PSU connector

008Rohit

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Yesterday, I've put all the cables of the MoBo out and reconnected them. Only once I've forgot to connect the PSU connector of the HDD and the system didn't boot and another time I've forgot to connect the 2x2 main power connector (aside the 10x2 one) but the system still boot to BIOS.
The system hangs at "Starting Windows"
I've tried installing Windows XP but no luck, that gives me a blue screen saying "pci.sys" error.
Any ideas?
 

008Rohit

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Is there any use of TPM and LPC_DEBUG slots? I couldn't find any wire of the PSU which fits those. Also, it seems I've forgotten to connect the Serial cable. The BIOS is alright right?As I can open BIOS Settings.
 

008Rohit

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I've run CHKDSK command from command prompt of System Recovery. It showed that all drives of the Hard Disk is fine..

Then I restored the system to a week back (when I had installed some windows updates) and Windows is now loading fine. :)

Thanks anyways for the replies.