problems since getting 4890

Hi all,

First specs:
Corsair 520hx 18A@12v rail x3/ 40A total
Ga-X38-DQ6 mobo
4 x 1gb 800mhz DDR2 (4-4-4-11) @ 2.05v
Q6600 G0 @ 3.4ghz @ 1.36v with Tuniq Tower120
Antec P182B with 3x Antec Tri-Cool 120mm
1x WD Raptor 74gb, 3x Seagate 500gb barracuda 7200.11
Samsung sata DWD+-rw
Sapphire Radeon 4890 Vapor-x
3 devices in usb (g5,g15,x360 controller wireless receiver)
SB X-Fi Xtreme Music
(everything is installed correctly)

and now to the problem.
After installing my new 4890 I've been having problems,
First, one of my HD's broke which I thought was pretty odd since I didn't touch them at all.(totally f.ed up, cant see it in bios in any of my 3 comps)

Second, when booting up the computer there is a 50% chance I will get picture on my display.
Either the GPU fan will spin at full speed and I get no picture, Windows will boot up normally I can hear the starting sound and all.
Or Everything will boot up just fine and GPU fan is not spinning at full speed.

So, Could it be that my PSU(2 years old) is starting to fail(and took one of my HD's with it) and that's why Im having a problem booting up.
Or could there be something wrong with the GPU (weird that it would boot 50% of the time with no problems :))

I keep hearing people say that 520hx could power a nuclear plant so that's why I'm having hard time thinking that it could be the problem.

Should I go get new PSU (thinking about corsair 850tx, modular seems pretty useless since im pretty much using all the cables anyway)
and then experience the same booting problems and end up throwing my computer from the balcony or would it fix everything,

What do you think?

Thanks

Seems to be a common problem with that card...here's some info: http://www.pcshoptalk.com/forum/showthread.php?t=14324&garpg=5You can also google HD4890 problems.