2005 PowerMac not starting up and power light flashing

I have a 2005 Intel Power Macwhich I inherited from work when we got news ones. It has been switched off for a couple of months, and last nigth I went to turn it on and it sounds like it is starting up, but nothing displays on the monitor, and after a while the power light starts flashing continuously.
The mac worked perfectly before I brought it home, and it's not been bashed or dropped. I tried to ask at the Genius Bar but they were no help because this is classed as a vintage computer. The guy mentioned it could be RAM, but I'm not sure I want to buy it just on the off chance.
When I did a bit of Googling last night I found people talking about it flashing 3 times, but it's more of a consistant flash, and pretty quick.
Does anyone have any advice they can give me, as I really need to get it working ASAP for a job.
Just wanted to add that it's an old montior I have hooked it up to, whicj also worked beforehand, but this says that it can't detect a signal and something about video output. Just in case it a monitor problem, althoguh the flashing light makes me think it's the mac!
Thanks in advance.

I had exactly the same problem with a 8 year old Powermac G5 1.8ghz dual processor. Like you I researched the web and found the hairdryer fix however before taking such drastic measures (given this melts the solder on the ram chips to create a connection), I ordered replacement ram and was advised to replace the ram chips in pairs to see if I could detect a faulty pair. In addition there is a reset switch on the mail board I was told to press prior to boot up.
Despite my efforts I couldn't revive my Mac. This was last Feb. it's still sat in a corner, never been used since. I've just (today) taken delivery of a new iMac, please an you elaborate where exactly did you direct the hairdryer and or how long.
Would love to get one last boot out of the g5 to do a time machine backup to an external drive to then restore to my iMac. Please let me know how you're getting along as I fear the life expectancy of your machine is limited. Backup, backup, backup. Good luck.

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2005 PowerMac not starting up and power light flashing

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