IMAC unable to boot from either Windows disk or Win partition

let me describe situation.

imac 27, 2009, 2 hdd: 1 stock hdd 1gb, 1 ssd crucial 256gb.
running below:

1gb hdd: 2 partition: 1 partition installed windows 7 64 bit
ssd: 2 partition: 1 mac os, 1 win 7 64 bit.

runs until yesterday.

reinstall win 7 on 1gb hdd using original win 7 disk. run setup file while running win 7. goes smoothly. however, when restart, press option key select partition installed win 7. not able boot. there apple logo, flashing/blinking empty folder. not stop. have press power restart. still able boot mac os.

use winclone clone image of win 7, used install on 2 partitions. process completes successfully. restart. imac can boot windows, however, stops after running bars appear 3 seconds , automatically restart. repeats.

decide erase on ssd, install mac os original disk, restore disk 1 partition only. erase other win 7 partition, because think somehow affects setup.
then, use bootcamp install win 7. put disk dvd drive, click start installation in bootcamp. imac restarts.
however, same thing happens: there apple logo, flashing/blinking empty folder. not stop. have press power restart. still able boot mac os.

don't know how proceed. suggestion welcome.

 

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