Tell me one thing, if my PSU is gone, would it power up my system?
Yeah. If a hard drive's pcb board is damaged the system will boot for a second and shut down asap- unless you unplug the sata/ide cables and the hdd connector. Depending on the damage on the rams, it would boot till it hits a certain load and gives BSOD or not boot the system at all. If nothing is getting displayed on the screen that mean graphic card can be damaged.
You can try connecting the pc to your screen if you want to and see if that helps to rule out the possibility. I strongly go against using another graphic card however.
Gosh...! Is the CoolerMaster 600W SMPS really that bad. How much can it pump out, and be at safe levels...?
The word is "obsolete". Here's CM extreme series:
CM series 500w is a quality degraded version of seventeam 500w. CM extreme 600w and cm extreme 500w are technically the same. Extreme series come with passive pfc and with no pfc- PCAR and PCAP. the passive pfc version comes with 2 types of heatsinks- copper and aluminium. Unfortunatly aluminium had problems and damaged the system and quietly introduced the copper version. But you get the aluminium ones are sold a lot over here. Long story made short- cm gets rid of their stuff in countries like India because majority of the buyers are either completly ignorant, fanboys or sadly don't get access to relevant information, mainly because completely ignorant people suggest based on fanboyism and limited experience.
This is coolermaster- when something gets sold a lot, they decrease the quality of the product. Don't be suprised, older cm 690 with front grills don't rust, but the newer ones, depending on the area, the front punched out tinsheet grill will rust due to moist. Word of advice to cm 690 users, dont wipe the front bezels with moist cloth or (as some people say it) "slightly" wet cloth.