Pc power led flashing

Hello, i am new in this forum.

i have some questions to ask, below

recently my PC PCIE graphicscard Nvidia Geforce 8500GT startet to make funny noises and suddenly my PC shots down, several times.

i took out the graphicscard very gently and the fan had lot of dust inside, so i just cleaned the fan by blowing with my mouth.
Then i did put the graphics card into the PC again, the PC wont start up anymore.
i have another PC with a ATI Radeon HD 3400 PCIE, i replaced the one before with the ATI Radeon gfx card, every thing went ok, it works now.
but i need the ATI Radeon gfx card the other PC, so i decided to buy a new graphics card in copenhagne, i went to a computer store and bougt a
ATI Radeon PCIE HD 5850 and did put it inside my pc, and switch my pc on, suddenly my PC power led is flashing 5-7 times with 1 secomd interval, then
continous to boot windos 7 normal.

i tried testing every thing with Sisoft sandra 2010 every things seems to work ok, i did use my PC for a couple of hours works ok.
i have installed the drives for the graphics card.

i tried to replace the old gfx card with the one thats works, its works with this gfx card (ATI Radeon HD 3400), my PC power led dosent flash when using thsi gfx card!.

i tried to Load BIOS to default, nothings seems to work, i mean i still get those flashing with the power led with the new ATI Radeon HD 5850 ( i think its 5850).
Even if i disconnect the SATA DVD burner to insure more power for the PC, it dosent have any effects!.

I idd tried to put the new gfx card into another PC, it got fucked up, blue screen erros, freezing strange gray noise screen.

What could possible be wrong with my pc and gfx card ?, i am stuck!.

is it memory, motherboard, psu, graphics card (maybe the graphicscard is defect?).

i am now using the ATI Radeon HD 5850 on my HP PC, atleast it works well in win 7 with games and HD video.

my PC IS

AMD Athlon x2 dualcore 2.4 ghz, 3gb ram ddr2 pc26400, western digital HDD-
Windows 7, 64 bit home premium
Adward Bios (i think!).

there is no onboard gfx card on my motherboard.

but as metioned before, still same problems when startiing up the pc / power led flash 5-7 times!.

ok, i will try that tommorow.
maybe i need a flash update for the bios ? (i am not happy to flash the bios, i heart horror stories "pc wont start up, after flashing etc....).

I think you don't have enough power to power up the 5850, what's your PSU?

my psu says, below (as i remember it).

maxium power output = 300W.

the geforce had the same problems with power led flashing.
i had used the geforce for a long times did`nt coursed any problems before.

i was only when i was experince problems with geforce card and swithing gfx card!

yes, i did discharge my self by touthing the metal plate on the power suply. before putting my hands inside the pc.

I realy think your 300W PSU may cause a problem here.

now i tried to check for loose cable molex, sata ,ide what ever i find in the computer jungle, ha, ha, no, i did check every cable, all cables are firmly atached to the pc.
i did took out the battery for 30 seconds, and did put it in, and did go to bios to confirm and did insert alle nessecry bios detiails (i remeber them all).
SAME PROBLEMS, PC POWER LED FLASHING A COUPLE OF TIMES, i know the flashing means something important , but i cant recall what it means .(as i remmeber it, 2-3 times beep or flashing means memoy and properly 5-7 times properly means power suply or pcie card suck to much power??).

well, i just hope the pc can last for 6 month, because i bought this pc in a super market, a demo model cheap, because i was lasy, i mean i use tyo build a couple of pc before and did a couple repai of pc before.
this time i am going to invest a lot o money (i dont know properly 2000$ (it should be 10000 kr i think), but i dont have that kind of money right now i need to save my money, but i will just buy a couple of things each momth, first win7, plus memory, next month motherboard and cpu, and then comes the rest).

i am not going to upgrade this old rubiish hp pc.

damm now i just spended 1 gfx card and 1 win7 for nothing.

maybe i should check this new gfx card for ekstra details about power reqirement, maybe its need more power, that my pc psu cant provide ?.
the question here is, can i dammagde my pc, if thsi gfc card has a insufficient psu ?, i am a little bit worrided!! (uhh). no more strsss.

and the other one that works is a ARI RADEON PCIE 3450 HD.
i deciced to put back this graphics back inside the pc, nwo every things works perfect, no more flashing blink power led or any other obscure errros.
i allso talk to some pc expert (as most of you are or atleast many of you guys have lots of experince i just know), said dont use this new gfc card becuase it will eventaully dammagde you psu.

i even thought taking out the psu from the ph pc i think i have an old cabinet woth a very power full 500-600 watt powersuply with sata etc...

i called the techninian at hp in denmark, and did ask about this power led flashing, he said to me mmaybe this is a normal thing, properly he mean i looks more beautyfull with a flsahing led, he said i could send it to reapir, but i did`nt know what it was, ohh my god, they are so stupid at hp.
i am not going to send it to repair, becuase they dont know how to reapir it, i just know, many people that sending their low budget pc to repair has lot of trouble.
and since i fix the problems myself and did my on repair, why do on earth do i need to send it to repair. i even have a mac pro, which i changed memory, dvd and hdd, plus i am going to buy a mac gfx card, i will never send any thing for repair.
i did 2 pc flashing bios and 1 soundcard flashing bios update firmware sucesfully, but thats the only thing i am afraid off.

this pc i bought is a familiy pc, for firt time user, which are supriced, if the can use notepad, and if they have any trouble with their pc, they just sendt the hp pc to hp and pay lots of money, this pc is not for me, really i am not that kind of a person, as said before i have been building pce before, how could i been so careless buying this lausy pc.

just wait and see if, i decide to change to psu in my ph pc, it will not take it, properly the powercables dosent fit on the motherboard, this is what you are getting if you buy somethiing from the spuermarked, my god, i will be so happy when i am going to buy a real pc and build it myself, cant wait.

I think i did found a desent graphics card that will work on my PC.
its a Nvdia Geforce 430 GT 1gb DDR3 PCIE. its cheap anyway.
Acording to Nvida , this gfx card only reqire a system PSU of min. 300W, and is great fo old PC`s, like Pentium 4 ect..
Do i dare to buy this cheap graphics card ?.

as i recall it its, 3.5 volt on pci i think and 5 volt on pcie

wait, i have to open the pc, i will do just that right now...

5v = 25A MAX
3,3V = 18A MAX

COMBINED POWER ON +5 AND 3.3V RAILS MUST NOT EXEED 175W
COMBINED POWER ON +12 AND 5V RAILS MUST ON EXEED 268W

ALL TOTAL MAX OUTPUT = 300W.
THATS WHAT IS SAYS ON MY PSU.

There's HUGE difference, between 5850 and 5450, 5850 is like 150-170+ W, while 5450 is <25 W /and doesn't need a dedicated power cable/ and 3450 needs about the same amount of power if I am not wrong. And a good quality 300W PSU may be able to power up a system with a Radeon 5450 /it depends also on other components/.
But again, it also depends of the quality of the PSU.

But in this case it looks to me more like something is wrong with the graphics card itself.
And why you don't try to put this 5450 on your other system - the one with the 3450, and see what happens then /this system should be able to support a 5450/?

i mean 5450 needs 400W PSU.

can i aply ohms law ?, i want to calulate each rail or pcie /pci port, how much 1 port can take.

cant remmeber how to calculate it, but i think its like this U=R*I
to find watt i think its p (w)= I/U ?.
I know atleast a geforce 210/ 220 need only 30W for the card itself, that should be plenty, since i dont have any pci or other devices.
and 1 pice or pci port can go up to 175w.

i just find out i can allso use a geforce 210/220 they only reqire 300w psu.

(if its not the motherboard).
tomorrow i will get my money back and buy a geforce 220, that should do it.

Actually Tom's says a GF210 needs more power as the 5450, other sources comply. Look at the articles.

yes, properly gt210 is consuming more power/w, but they (nividia) only mean i think, that the system must atleast have a psu of minium 300w, and if the crad itself realy takes more power than specified on nvidia website, itas properly true.

i bought the geforce gt 210 pcie today, and insertet it, itnow works perfectly, without any flashing power led ect...
and the other pc works welll with radeon 3450.
so every thing is ok.

iy properly as the psu and the graphics that did the problems.

geforce 210 is performing lausy, the performance is far from a gt8500 which is relative slow.
ok i did`nt expect any suprice or fast perofrmance but just a ordinary good speed, but no, is really slow (the pcis not slow, only when playing games, which i rary dont do!). i need to buy something better!.