3G iPhone, infinite reset loop after "reset all settings" cannot DFU or restore mode
Hi everyone. I have already done a search and followed the instructions people have given in similar cases, however my iPhone hasn't responded to them.
Basically I bought a 8GB 3G iPhone second hand. The seller told me it had software problems and what happened is he had the phone jailbroken and unlocked, then due to wanting to sell it he pressed "reset all settings". The phone did this and then got stuck in its current eternal reset loop. It trys to boot up but gets stuck on the Apple logo for a few minutes, then the spinning circle comes up and it restarts and gets stuck on the Apple logo again.
iTunes on OSX does NOT detect the phone at all.
The standard sollution I have read is to put the phone in recovery mody / DFU mode. However this phone is not responding at all to pushing the home/power button. Over and over Ive tried it for 10 seconds, for 5 seconds, I've even tried holding them for a minute. I've also tried holding the home button as I plug it in. It seems to not respond at all to this.
Apparently it was working perfectly fine before the reset all settings and apparently it only a software fault.
So how do I fix the phone? How can I get it in recovery mode? Or get iTunes to detect it?